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Article

Flexible Co(II)-and Ni(II)-Based Cationic 2D Metal–Organic Frameworks Based on a Charge-Neutral (O,O)-Donor Bridge

by
Pavel A. Demakov
*,
Konstantin A. Kovalenko
,
Alexander N. Lavrov
and
Vladimir P. Fedin
*
Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia
*
Authors to whom correspondence should be addressed.
Inorganics 2023, 11(6), 259; https://doi.org/10.3390/inorganics11060259
Submission received: 22 May 2023 / Revised: 13 June 2023 / Accepted: 15 June 2023 / Published: 17 June 2023
(This article belongs to the Special Issue 10th Anniversary of Inorganics: Coordination Chemistry)
Browse Figures
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Abstract

:
Two new metal–organic frameworks based on highly flexible 1,4-diazabicyclo[2.2.2]octane N,N′-dioxide (odabco) ligands were successfully synthesized and characterized. Their crystallographic formulae are [M(DMF)2(odabco)2](ClO4)2·dioxane, where M2+ = Co2+ (1) and Ni2+ (2), and DMF is N,N-dimethylformamide. The title compounds possess cationic 2D coordination networks filled with perchlorate anions and dioxane solvent molecules in the interlayer space, with 20% solvent accessible volume. Carbon dioxide adsorption measurements for desolvated samples 1a and 2a gave 511 m2/g and 377 m2/g specific surface areas, respectively, revealing the first example of gas adsorption properties in the structure based on a flexible odabco bridge, despite the presence of large counteranions within the positively charged network. Magnetization measurements for 1, 1a, 2 and 2a reveal their paramagnetic nature to be in a reasonable agreement with crystal structures, and almost no solvent dependence of the magnetization characteristics. A decrease in the effective magnetic moment observed at low temperatures is attributed mostly to zero-field level-splitting in the octahedral Ni2+ and Co2+ ions.

1. Introduction

Metal–organic frameworks (MOFs) represent an extensively growing class of coordination compounds, consisting of metal blocks and organic bridging ligands. Typically, MOFs are based on carboxylate anions, capable of a decently strong binding to the wide range of metal ions [1,2], or di-/polytopic N-donor bridges, whose strong coordination abilities are mostly related to Pearson’s soft cations [3,4,5]. Metal–organic frameworks based on ligands of such types as well as their-derived composites are widely used in the selective adsorption [6], gas separations [7], electrochemical devices [8,9] and single-molecule magnets [10].
Electroneutrality is a rather rare feature of polytopic (O,O)-donor bridges in polymeric coordination networks. Such uncharged bridging ligand classes as polyethers [11], carbohydrates [12,13], cyclodextrins [14,15], and different type polyamides [16,17], including cucurbit[n]urils [18], are mainly represented by alkali and alkaline earth metal-based cationic networks in MOF chemistry, with an accordingly limited range of functional properties.
At the same time, positively charged coordination frameworks are promising for the synthesis of highly crystalline anion sorbents [19,20,21,22], sensors [22,23,24], and for easy post-synthetic functionalization via ion exchange [25,26,27,28,29]. Using charge-neutral (O,O)-donors with wide coordination abilities is a powerful route for the design of cationic MOFs. Aromatic N,N′-dioxides are apparently the most studied subclass of uncharged (O,O)-donors in this chemistry. Such types of ligands can form strong coordination bonds with Pearson’s both hard and soft cations due to a high negative charge located on N-oxide oxygen atoms [30]. Incorporation of large functional anions, such as POMs [31], cyanometallates [32,33], halometallates [34,35], and borane clusters [36], has been achieved for aromatic N,N′-dioxide-based MOFs, and their guest-dependent structural dynamics [37], thermochromism [38], multibanded luminescence [30,39,40], photovoltaic generation [34,35], and slow magnetic relaxation [41] have been extensively studied in previous works.
On the contrary, aliphatic N,N′-dioxides are poorly studied as ligands in MOF chemistry. 1,4-Diazabicyclo[2.2.2]octane N,N′-dioxide (odabco) is easily synthesized from the corresponding tertiary amine dabco [42]. Previous studies have revealed that odabco does not suffer from steric hindrance [43], being able to hexa-coordinate different transition metal ions [44,45,46,47] in spite of its bulky alicyclic core. Further, the odabco alicyclic bridge possesses a very high degree of flexibility due to its several inversion, rotation and torsion modes, resulting in very high structural diversity [45,48,49], possible breathing, and ferroelectricity [50,51,52] in the relevant structures. Expanding the family of alicyclic N,N′-dioxide-based MOFs towards magnetic and catalytically active transition metal ions, such as Co(II) and Ni(II), could result in new types of functional and dynamic materials. So far, only two cobalt- [46] and no nickel-based odabco structures have been reported, to the best of our knowledge. Herein, we report the synthesis, crystal structures, and characterization of two new metal–organic frameworks with the formulae [M(DMF)2(odabco)2](ClO4)2·dioxane, where M2+ = Co2+ (1) and Ni2+ (2), DMF = N,N-dimethylformamide. Isostructural 1 and 2 possess positively charged layered coordination networks with the interlayer space filled by large perchlorate counteranions and solvent molecules. The permanent porosity of the activated samples 1a and 2a was confirmed by CO2 adsorption measurements. Magnetization measurements revealed the purely paramagnetic properties of the studied compounds, in agreement with the large spatial separation between the metal ions in their crystal structures.

2. Results and Discussion

2.1. Synthesis and Characterization

A porous metal–organic framework with the crystallographic formula [Co(DMF)2(odabco)2](ClO4)2·dioxane (1) was obtained by heating cobalt(II) perchlorate and odabco·3H2O2 in a mixture of N,N-dimethylformamide (DMF) and dioxane, acidified by HClO4, at 90 °C for two days. Lowering the content of perchloric acid in a synthetic system leads to the formation of visually observable black or brown impurities, while increasing the HClO4 content reduces the yield. Similar pink plate-like crystals form if using pure DMF instead of a DMF/dioxane mixture, but the addition of dioxane was found to improve the diffraction, forming very thin plates, and to lower their twinning degree. Compound [Ni(DMF)2(odabco)2](ClO4)2·dioxane (2) was synthesized using a similar method, except changing cobalt(II) perchlorate to nickel(II) perchlorate. Powder X-ray diffraction (PXRD) data for the filtered samples confirm their phase purity, although a pronounced preferred orientation of thin plates apparently exists according to the obtained patterns (Figure A1; see Appendix A). Elemental CHNCl analysis data (see the experimental) for the bulk sample of 1 correspond well to the formula [Co(DMF)2(odabco)2](ClO4)2·0.3dioxane·3H2O, which appears in a reasonable agreement with its coordination network composition and porosity, showing some substitution of guest dioxane by water in the sample during its storage. The CHNCl analysis data for 2 almost perfectly match its crystallographic formula [Ni(DMF)2(odabco)2](ClO4)2·dioxane, also confirming both the chemical nature and purity of the title compound.

2.2. Crystal Structure Description

According to single-crystal X-ray diffraction (SCXRD) data, compounds 1 and 2 are isostructural. Therefore, only crystal structure of cobalt(II)-based 1 will be described in detail. The compound crystallizes in the monoclinic system with a C2/c space group. The independent unit consists of half of a Co(II) ion, one odabco and one DMF ligand, one perchlorate counteranion, and a half of a dioxane molecule. Each Co(II) is coordinated by four O atoms of four odabco bridges and two O atoms of two DMF terminal ligands (Figure 1a), thus adopting an octahedral environment. The Co–O(odabco) bond lengths are 2.040(2) Å and 2.1238(18) Å. These values fit well to the typical bond lengths’ range for octahedral Co(II) complexes with different N-oxides, nitroxyl radicals, and oxime ligands [53,54,55,56,57,58,59,60]. The Co–O(DMF) bond length is 2.156(2) Å. Due to the opposite location of two terminal DMF ligands, Co(II) ions represent square nodes, which are interconnected in four directions with extended N,N′-dioxide bridges to form a rectangular sql-type layer (Figure 1b). The layer windows are ca. 3·3 Å2 in size. However, neighboring layers are packed in an ABAB manner to each other, with a 0.5a + 0.5c offset; thus, no channel is formed in the 3D structure of 1 by their windows.
The interlayer space contains other channels of ca. 2·5 Å2 size, paved by coordinated DMF and odabco moieties in the perpendicular directions (Figure 2a). Guest dioxane molecules, which are disordered over two close positions, are located in the center of the channels, while perchlorates are situated nearer the abovementioned intralayer windows (Figure 2b). An analysis of the closest molecular environment of perchlorate reveals several weak C–H…O hydrogen bonds to the aliphatic core of odabco bridges and the DMF methyl groups, the latter being the shortest ones. The O(ClO4)…C(CH3) distances are 3.13 Å and 3.19 Å, slightly lower than the sum of (C+O) WdW radii (ca. 3.22 Å). The corresponding CHO angles are slightly bent to 150° and 140°, respectively, suggesting hydrogen bonding. The O(ClO4)…C(CH2) distances, also marked in Figure 3b, lie in the 3.32…3.42 Å range and possess bending angles of 138…167°, also fitting to the criterion of weak C–H…O hydrogen bonds (less than 3.5 Å C…O distance and more than 120° CHO angle), previously formulated in the relevant literature [61]. At the same time, each Co…O(ClO4) distance exceeds 5.7 Å, showing that the exact location of poorly coordinating perchlorate is only driven by weak intermolecular interactions between the anion and aliphatic moieties of the coordination framework. Such cationic behavior is typically achieved for Co(II) and Ni(II)-based polymeric complexes containing perchlorates, if using diverse types of charge-neutral bridging ligands [62,63,64,65,66]. Examples of Co(II) and Ni(II) perchlorates with anionic bridges are much rarer [67,68]. A few works also report the coordination of perchlorate with Co(II) or Ni(II) within the relevant polymeric networks [69,70].
According to the PLATON [71] estimation, the layered coordination network in 1 and 2 possesses 20% total void volume, if erasing dioxane from the structure. The corresponding voids filled by dioxane represent holistic 1D channels, suggesting possible guest exchange and even permanent porosity of the discussed MOFs after deleting the uncharged guest molecules. Indeed, we managed to obtain porous MOF activated samples after dioxane exchange to a more volatile THF and a subsequent evacuation of the solvent. The corresponding activated samples are denoted as 1a and 2a. 1H NMR spectra were recorded for the activated samples after their digestion to analyze the solvent content (Figure A3, see Appendix A). As shown in Table A1, the summary DMF and THF amounts in 1a and 2a are 1.61 and 1.49, respectively, lower than a number of coordinated DMF molecules in the initial 1 and 2 crystal structures (2.00). Apparently, a partial substitution of a coordinated DMF by THF occurs upon solvent exchange. Subsequent evacuation leads to a partial evaporation of coordinated THF along with the full release of guest molecules, giving an understated amount of coordinated solvent molecules in 1a and 2a. However, a further resolvation experiment controlled by PXRD (Figure A4 in the Appendix A) shows a full restoration of the initial PXRD pattern, illustrating a fully reversible breathing transition between the solvent-saturated crystal structure and its activated form.

2.3. Adsorption Measurements

Adsorption–desorption isotherms of carbon dioxide measured at 195 K for 1a and 2a are shown in Figure 3. Both investigated compounds exhibit stepped carbon dioxide isotherms, typical of the gate-opening effect or breathing behavior, with pronounced adsorption steps in 0.35–0.42, and 0.30–0.38 relative pressure ranges for 1a and 2a, respectively. The significant adsorption–desorption hysteresis supports this suggestion. The presence of such a type of hysteresis is typically explained by pronounced breathing in the adsorbents upon saturation, and accompanies gate-opening transitions [72,73,74]. The saturation volumes are ca. 81 cm3(STP)·g−1 for 1a and 60 cm3(STP)·g−1 for 2a. Both adsorption branches consist of two segments. The first segment corresponds to adsorption on the non-porous phase and can be described by the Brunauer–Emmett–Teller (BET) model (Figure A5 and Figure A6; see Appendix B). The second one corresponds to adsorption on the open phase, and can be satisfactorily described by the Langmuir equation (Figure A7 and Figure A8; see Appendix B). The monolayer capacities of non-porous forms calculated from the BET equation are 0.285 and 0.193 mmol·g−1 for 1a and 2a. According to Langmuir calculations after transformation into a more porous state, the monolayer capacities increase up to 4.04 and 2.98 mmol·g−1, respectively. The corresponding specific surface areas and pore volumes increase by 1–1.5 orders of magnitude (see Table 1). Nevertheless, the pore volumes, even in open form, are lower than expected volumes according to crystal structures, which were estimated to be 0.15 cm3·g−1. This mismatch can be explained by the quite low interaction energy between the carbon dioxide and frameworks’ surface. Indeed, the prediction of the interaction energy of the first adsorbate layer from the BET equation results in heats of carbon dioxide adsorption as low [75,76,77] as 18.5 kJ·mol−1 for 1a and 20.2 kJ·mol−1 for 2a. Taking into account the heat of carbon dioxide liquefaction of 16.5 kJ·mol−1, the additional energy gain is too small to provide any benefit for the full frameworks’ opening. A more significant step or additional gate-opening steps are expected for other adsorbates with higher surface–adsorbate interaction energy. Moreover, gate-opening steps should be at different pressures and uptakes for different adsorbates, which allows us to consider compounds 1a and 2a potentially interesting systems for selective adsorption or sensing. More detailed experiments are needed, and may be presented in our further publications. The described significant breathing effects of 1a and 2a might be attributed to both the conformation mobility of the linker and the relative displacement motions of the layers.

2.4. Spectroscopic Characterization

All the four samples were characterized using infrared spectroscopy. The recorded spectra (Figure 4a) contain characteristic absorption bands of the C(sp2)–H bond (≈3034 cm–1; medium); C(sp3)–H bond (≈2993 cm–1; weak) and amide C=O bond (≈1662 cm–1; strong) vibrations, all corresponding to DMF, C(sp3)–H bond vibrations (≈2935 cm–1; weak) in the odabco aliphatic core and Cl–O bond vibrations (≈1097 cm–1; very strong and ≈624 cm–1; strong) in the perchlorate anion [78,79]. Several absorption bands, situated in the 3420–3560 cm–1 region, are apparently attributed to O–H bond vibrations, originating from some possible watering of the samples during their storage and preparation for IR measurements. Therefore, the infrared spectra of all the four compounds are entirely similar to each other and confirm their molecular composition. In particular, the presented IR data show no considerable changes in the chemical nature of the activated samples 1a and 2a, compared to their solvent-filled parents 1 and 2.
The UV/vis absorption of solid 1 and 2 was investigated via diffuse reflectance spectroscopy (DRS). As shown in Figure 4b, compound 1 possesses one absorption band in the green region with λmax = 530 nm, apparently corresponding to d-d electron transitions in Co2+, hexa-coordinated by oxygen [80,81] and providing its pink color as a mixture of low-wavelength violet and high-wavelength red color components. Oppositely, the DRS spectrum of 2 contains an absorption band in the violet-blue region with λmax = 418 nm and a very wide weak band in the red/NIR area (λmax ≈ 776 nm), providing a green color quite typical of Ni2+ complexes with an octahedral [82,83] oxygen environment. No bands attributed to other molecular constituents were found for both 1 and 2, as the odabco aliphatic ligand possesses negligible absorption, even in the UVB region, due to the absence of any conjugated π-system. Moreover, the expectedly weak extinction of both DMF and perchlorate is apparently overlapped by the optical absorption of the air medium, arising in the hard UVC area.

2.5. Magnetization Measurements

The temperature dependences of the magnetic susceptibillity χp(T) were measured to examine the spin states of metal centers and to analyse the possible magnetic interactions between them. As can be seen in Figure 5, compounds 1 and 1a demonstrate a paramagnetic behavior in the entire temperature range 1.77–300 K, without any anomaly that could be attributed to the magnetic ordering of Co2+ ions. However, the χp(T) pattern deviates from the simple Curie–Weiss law, which implies that the magnetic moments of Co2+ ions are temperature-dependent. Indeed, the effective magnetic moment μeff formally calculated for 1 gradually decreases from μeff = 4.78 μB at T = 300 K down to μeff = 3.81 μB at T = 1.77 K (Figure 5a). The high-temperature μeff = 4.78 μB agrees well with the values commonly observed for octahedrally coordinated Co2+ ions with a high-spin configuration (S = 3/2) and a considerable contribution of orbital moments [84]. The strong decrease in the effective magnetic moment obseved on cooling originates predominantly from the zero-field-splitting (ZFS) of Co2+ ion levels [85]. It is worth emphasizing that in the lowest temperature region, the μeff(T) dependence slows down, and μeff saturates at a temperature-independent level (inset in Figure 5a). This is direct evidence of a negligible interaction between Co2+ ions. In fact, as soon as the single-ion parameters are finally settled at low temperatures, the χp(T) dependence acquires a simple Curie shape χp = C/T, i.e., the behavior of an ideal paramagnet with a negligible interection between ions. Therefore, the paramagnetic behavior of 1 is entirely consistent with its crystal structure, which comprises the only spatially separated metal ions with the intermetal distances exceeding 8.2 Å. Such distances are too high to provide any considerable exchange occuring between single Co2+ ions. The activated sample 1a demonstrates almost the same behavior (Figure 5b), with the corresponding values of μeff = 4.69 μB at T = 300 K and μeff = 3.75 μB at T = 1.77 K.
The χp–1(T) and μeff(T) dependences measured for the samples 2 and 2a also confirm their paramagnetic behavior (Figure 6). The effective magnetic moment for 2 is μeff = 3.32 μB at T = 300 K, and slightly exceeds the theoretical spin-only value of μeff = 2.83 μB for Ni2+ (S = 1) ions in the octahedral coordination environment. Such a difference is not surprising and can be explained by the spin–orbital coupling, which, however, for Ni2+ is typically weaker than for Co2+. The μeff value for 2 gradually lowers upon cooling and reaches a 3.22 μB value at T = 30 K, presumably following the decreasing contribution of the orbital moment. Upon further lowering the temperature, the effective magnetic moment of 2 sharply drops down to 2.15 μB at T = 1.77 K. Such a steep μeff decrease may come from the zero-field level-splitting (expected for Ni2+ (S = 1) ions), as well as from a weak antiferromagnetic exchange interaction between metal ions. Analysis of the μeff(T) dependence has shown that it cannot be fitted if ony the exchange interaction is taken into account, yet a good fit (dashed lines in Figure 6) can be obtained if zero-field splitting with the axial ZFS parameter D/kB ≈ 7.4 K is introduced, following the approach described in Ref. [85], together with a small additional intermetal exchange interaction zJ/kB ≈ 0.17 K (z is the number of nearest neighbors). The obtained D value is typical of Ni(II) complexes [86], while the small zJ value may indicate a tiny intermetal magnetic exchange in 2. Given the immeasurably low exchange interaction found in isostructural Co compounds, it is not certain whether the small additional term observed for 2 is actually reflecting the intermetal exchange, or if it comes from an unaccounted single-ion feature. Whatever the case, we can conclude that the magnetic behavior of 2 is close to that of an ideal paramagnet, with the J/kB certainly less than 0.1 K. The magnetic behavior of the activated sample 2a is similar to its parent 2 (with just slightly lower D/kB of 6.3 K; see Figure 6b), ensuring full preseravion of the layered coordination network during the evacuation of the guest solvent.

3. Materials and Methods

3.1. Materials

Cobalt(II) perchlorate hexahydrate, nickel(II) perchlorate hexahydrate, N,N-dimethylformamide (DMF) and dioxane, all of reagent grade, were supplied by Vekton (Saint Petersburg, Russia). Perchloric acid (HClO4; 65% water solution, reagent grade) was supplied by Reachem (Moscow, Russia). Tetrahydrofuran (THF; reagent grade, hydroquinone-stabilized) was supplied by Reaktiv (Novosibirsk, Russia). Odabco·3H2O2 was synthesized according to the previously published procedure [45].

3.2. Instruments

Infrared (IR) spectra were obtained in the range of 4000−400 cm−1 on a Bruker Scimitar FTS 2000 spectrometer in KBr pellets. Elemental CHNS analyses were carried out using a VarioMICROcube device. Powder X-ray diffraction (PXRD) data were acquired on a Shimadzu XRD-7000 diffractometer (Cu-Kα radiation, λ = 1.54178 Å) at room temperature. Diffuse reflectance spectra were recorded using a Shimadzu UV-3101 spectrometer. The initial dependencies of the reflection of samples (R) on the wavelength were recalculated with the Kubelka–Munk function (M) using the equation: M = (1 − R)2/2R. A small shift in the curves of the DR spectra at λ = 360 nm is an instrumental error and related to the switching of the light source in the spectrometer. 1H NMR spectra were recorded on a Bruker Advance 500 NMR spectrometer (500.13 Hz). The analyte solutions for NMR were prepared by dissolving ca. 5 mg of 1a and 2a in 0.8 mL of D2O, then adding a ca. 15 times excess of NaOH dissolved in 0.4 mL of D2O, followed by a careful decantation of the liquids from metal hydroxide precipitates.
The porous structure was analyzed using carbon dioxide adsorption on a Quantachrome’s Autosorb iQ gas sorption analyzer at 195 K. A CryoCooler™ cryostat was used to control the sample temperature at 195 K, with 0.05 K accuracy. Initially, the compound was activated under a dynamic vacuum at 50 °C for 6 h. Weight loss during the activation procedure was 9.9% and 7.5% for compounds 1a and 2a correspondingly, which is in a good agreement with loss of guest THF molecules. The carbon dioxide adsorption−desorption isotherms were measured within the range of relative pressures from 10−3 to 0.995. The specific surface area was calculated from the data obtained using conventional Langmuir and BET models. Pore volumes were calculated as the amount of vapor adsorbed at a relative pressure close to unity for open form and P/P0 = 0.3 for closed form, assuming that the pores are filled with a liquid adsorbate.
Diffraction data for single crystals of 1 and 2 were collected on an automated Agilent Xcalibur diffractometer equipped with an AtlasS2 area detector and graphite monochromator (λ(MoKα) = 0.71073 Å). The CrysAlisPro program package [87] was used for the integration, absorption correction, and determination of unit cell parameters. A dual-space algorithm (SHELXT [88]) was used for structure solution, and a full-matrix least squares technique (SHELXL [89]) was used for structure refinement. Anisotropic approximation was applied for all atoms except hydrogens. The positions of hydrogen atoms of organic ligands were calculated geometrically and refined in the riding model. Details for single crystal structure determination experiments and structure refinements are summarized in Table A2 (See Appendix C). CCDC 2,264,393 (1) and 2,264,394 (2) entries contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Center at https://www.ccdc.cam.ac.uk/structures/ (accessed on 16 May 2023).
Magnetization measurements were performed using a Quantum Design MPMS-XL SQUID magnetometer in the temperature range of 1.77–300 K at magnetic fields up to 10 kOe. In order to determine the paramagnetic component of the molar magnetic susceptibility, χp(T), the temperature-independent diamagnetic contribution, χd, and a possible magnetization of ferromagnetic micro-impurities, χFM(T), were evaluated and subtracted from the measured values of the total molar susceptibility, χ = M/H. While χd was calculated using the Pascal’s additive scheme, χFM(T), if any, was determined from the measured isothermal M(H) dependencies and the M(T) data taken in different magnetic fields. To determine the effective magnetic moment (µeff), temperature dependences χp(T) were analyzed using the Curie–Weiss dependence:
χ p ( T ) = N A μ eff 2 / 3 k B ( T − θ )
where NA and kB are the Avogadro number and the Boltzmann constant, respectively.

3.3. Synthetic Methods

Care should be taken in all the procedures carried out with 1,4-diazabicyclo[2.2.2]octane N,N′-dioxide tris-(hydrogen peroxide) solvate (odabco·3H2O2) and odabco compounds with potentially explosive anions such as perchlorate.
Synthesis of [Co(DMF)2(odabco)2](ClO4)2∙dioxane (1). 70 mg (0.20 mmol) of Co(ClO4)2∙6H2O, 49 mg (0.20 mmol) of odabco∙3H2O2, and 2.5 mL of DMF, 2.5 mL of dioxane and 40 μL of HClO4 (65% solution in water) were mixed in a glass vial with a screw cap. The mixture was treated in an ultrasonic bath upon full dissolution (ca. for 5 min) and then heated at 90 °C for 48 h. The formed pink crystals were filtered on a porous paper filter, washed with DMF, then with dioxane, and dried in air. Single crystals suitable for the SCXRD were taken from the mother liquor before the filtration. Yield: 64 mg (42%). Elemental analysis data (%): C, 29.8; H, 5.6; N, 10.7; Cl, 9.2. Calculated for [Co(DMF)2(odabco)2](ClO4)2∙0.3dioxane∙3H2O (%): C, 29.8; H, 6.1; N, 10.9; Cl, 9.2.
Synthesis of [Ni(DMF)2(odabco)2](ClO4)2∙dioxane (2) was carried out analogously to the synthesis of 1, except changing Co(ClO4)2∙6H2O to a similar amount as Ni(ClO4)2∙6H2O. The formed light green crystals were filtered on the porous paper filter, washed with DMF, then with dioxane, and dried in air. Single crystals suitable for the SCXRD were taken from the mother liquor before the filtration. Yield: 57 mg (37%). Elemental analysis data (%): C, 33.6; H, 5.9; N, 10.8; Cl, 9.5. Calculated for [Ni(DMF)2(odabco)2](ClO4)2∙dioxane (%): C, 33.9; H, 5.9; N, 10.8; Cl, 9.1.
Synthesis of activated 1a. A ca. 60 mg sample of 1 was immersed in 5.0 mL of THF. The solvent was refreshed once after two days of immersion. After four days, the sample was filtered, washed with THF, and dried in air.
Synthesis of activated 2a was carried out using a similar procedure carried out with 2 instead of 1.

4. Conclusions

To summarize, two new metal–organic frameworks based on a highly flexible 1,4-diazabicyclo[2.2.2]octane N,N′-dioxide bridging ligand were synthesized and characterized using a combination of X-ray diffraction, chemical analysis, spectroscopic analysis, gas adsorption, and magnetization methods. Compounds possess layered cationic coordination networks and preserve their gas adsorption capability in the activated state, driven by gate-opening transitions upon CO2 saturation. Magnetization measurement results, along with other experimental data, confirm coordination network structure preservation within the activated samples and reveal a cation-dependent magnetization behavior. Zero-field level-splitting, which prompts a decrease in the effective magnetic moments of metal ions at low temperatures, was found for both the nickel(II)- and cobalt-based compounds.

Author Contributions

Conceptualization, P.A.D.; methodology, P.A.D., A.N.L., K.A.K. and V.P.F.; software, K.A.K.; validation, P.A.D., A.N.L., K.A.K. and V.P.F.; formal analysis, P.A.D., A.N.L. and K.A.K.; investigation, P.A.D., A.N.L. and K.A.K.; resources, V.P.F.; data curation, P.A.D. and V.P.F.; writing—original draft preparation, P.A.D., A.N.L. and K.A.K.; writing—review and editing, V.P.F.; visualization, P.A.D., A.N.L. and K.A.K.; project administration, V.P.F.; funding acquisition, V.P.F. All authors have read and agreed to the published version of the manuscript.

Funding

The authors are grateful to the Ministry of Science and Higher Education of the Russian Federation for financial support (Agreement No. 075-15-2022-263), and for providing access to the large-scale research facility “EXAFS spectroscopy beamline”.

Data Availability Statement

CCDC 2264393 (1) and 2264394 (2) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge at Cambridge Crystallographic Data Center (https://www.ccdc.cam.ac.uk/structures/; accessed on 16 May 2023), or from the authors upon request.

Conflicts of Interest

The authors declare no conflict of interest.

Appendix A. Additional Characterization Data

Inorganics 11 00259 g0a1 550
Figure A1. Experimental PXRD patterns of the filtered samples 1 (a) and 2 (b) compared to the theoretical samples.
Figure A1. Experimental PXRD patterns of the filtered samples 1 (a) and 2 (b) compared to the theoretical samples.
Inorganics 11 00259 g0a1
Inorganics 11 00259 g0a2 550
Figure A2. Diffuse reflectance spectra of the dry 1 and 2 in R(λ) dependencies.
Figure A2. Diffuse reflectance spectra of the dry 1 and 2 in R(λ) dependencies.
Inorganics 11 00259 g0a2
Inorganics 11 00259 g0a3 550
Figure A3. 1H NMR spectra of 1a and 2a digested in D2O/KOH.
Figure A3. 1H NMR spectra of 1a and 2a digested in D2O/KOH.
Inorganics 11 00259 g0a3
Table
Table A1. Assignment for 1H NMR spectra for 1a and 2a.
Table A1. Assignment for 1H NMR spectra for 1a and 2a.
Peak Position, ppmIntegral, a.u.AssignmentAmount in One MoleculeMolecular Units, a.u. *
8.37 (1a)
8.39 (2a)		1.000HCO (DMF)11.44 DMF (1a)
1.43 DMF (2a)
2.19 (1a)
2.22 (2a)		6.519 (1a)
6.635 (2a)		HCH3 (DMF)6
3.89 (1a)
3.89 (2a)		18.133 (1a)
18.075 (2a)		HCH2 (odabco)122.00 odabco
(1a and 2a)
3.67 (1a)
3.69 (2a)		0.488 (1a)
0.179 (2a)		HCH2O (THF)40.17 THF (1a)
0.06 THF (2a)
1.80 (1a)
1.82 (2a)		0.516 (1a)
0.176 (2a)		HCH2CH2 (THF)4
* Molecular constituent contents were normalized for the odabco amount to 2.00 for clarity.
Inorganics 11 00259 g0a4 550
Figure A4. PXRD patterns of activated 2a and resolvated 2 compared to the theoretical PXRD pattern.
Figure A4. PXRD patterns of activated 2a and resolvated 2 compared to the theoretical PXRD pattern.
Inorganics 11 00259 g0a4

Appendix B. Adsorption Supplementary Data

Appendix B.1. BET Calculations

According to BET theory, the adsorption isotherm may be described by this equation:
1 n ⋅ P 0 P − 1 = 1 w ⋅ C + C − 1 w ⋅ C ⋅ P P 0
where n—amount adsorbed [mmol/g], w—monolayer capacity [mmol/g], C—BET constant, P/P0—relative pressure.
The specific surface area of the sample can be expressed as
S BET = w ⋅ N A ⋅ A c s
where NA—Avogadro’s number, Acs—cross-sectional area (21.0 Å2 for CO2).
The interaction energy of the first adsorbate layer can be calculated from the BET constant C, which is an energetic characteristic of adsorption:
C = e x p E 1 − E L R T
where E1—the interaction energy of the first adsorbate layer, EL—the heat of liquefaction.
According to these equations, the specific surface area and the interaction energy of the first adsorbate layer were evaluated for the closed forms of the compounds 1a and 2a.
Inorganics 11 00259 g0a5 550
Figure A5. BET calculation plots for 1a (C—BET constant, w—monolayer capacity in mmol·g−1).
Figure A5. BET calculation plots for 1a (C—BET constant, w—monolayer capacity in mmol·g−1).
Inorganics 11 00259 g0a5
Inorganics 11 00259 g0a6 550
Figure A6. BET calculation plots for 2a (C—BET constant, w—monolayer capacity in mmol·g−1).
Figure A6. BET calculation plots for 2a (C—BET constant, w—monolayer capacity in mmol·g−1).
Inorganics 11 00259 g0a6

Appendix B.2. Langmuir Calculations

The Langmuir equation can be expressed as
P / P 0 n = 1 w ⋅ K + P / P 0 w
where n—amount adsorbed [mL/g], w—monolayer capacity [mL/g], K—Langmuir equilibrium constant, P/P0—relative pressure.
The specific surface area can be calculated from the monolayer capacity using the same equation as in the BET method.
Inorganics 11 00259 g0a7 550
Figure A7. Langmuir calculation plots for 1a (K—Langmuir equilibrium constant, w—monolayer capacity in mL (STP)·g−1).
Figure A7. Langmuir calculation plots for 1a (K—Langmuir equilibrium constant, w—monolayer capacity in mL (STP)·g−1).
Inorganics 11 00259 g0a7
Inorganics 11 00259 g0a8 550
Figure A8. Langmuir calculation plots for 2a (K—Langmuir equilibrium constant, w—monolayer capacity in mL (STP)·g−1).
Figure A8. Langmuir calculation plots for 2a (K—Langmuir equilibrium constant, w—monolayer capacity in mL (STP)·g−1).
Inorganics 11 00259 g0a8

Appendix B.3. Pore Volumes

The volume of carbon dioxide adsorbed (Vads) can be converted to the volume of condensed carbon dioxide, which is assumed to be equal to the pore volume:
V pore = V ads V M ⋅ M ρ = V ads V M ⋅ V m
where VM—the molar volume of gas at STP (22.414 cm3/mol), M—the adsorbate molar mass (44.01 g/mol), ρ—the density of condensed carbon dioxide (1.564 g·cm3), Vm—the molar volume of the condensed carbon dioxide (28.14 cm3/mol).

Appendix C. The Crystallographic Data

Table
Table A2. Single crystal X-ray determination and structure refinement details.
Table A2. Single crystal X-ray determination and structure refinement details.
12
Chemical formulaC22H46Cl2CoN6O16C22H46Cl2N6NiO16
Mr/g·mol–1780.48780.26
Crystal systemMonoclinicMonoclinic
Space groupC2/cC2/c
Temperature/K237130
a/Å12.1805(6)12.1891(3)
b/Å23.3427(14)23.0318(6)
c/Å12.1557(5)11.9842(3)
α/°9090
b/°90.975 (4)91.577 (2)
γ/°9090
V/Å33455.7(3)3363.13(15)
Z44
F(000)16361640
D(calc.)/g·cm–31.5001.541
μ/mm–10.730.81
Crystal size/mm0.40 × 0.40 × 0.060.27 × 0.25 × 0.07
θ range for data collection/°1.87 ≤ θ ≤ 25.353.34 ≤ θ ≤ 25.34
No. of reflections: measured/independent/observed [I > 2σ(I)]7638/3175/26067249/3081/2696
Rint0.02550.0170
Index ranges–14 ≤ h ≤ 14
–28 ≤ k ≤ 23
–14 ≤ l ≤ 12		–14 ≤ h ≤ 14
–27 ≤ k ≤ 19
–13 ≤ l ≤ 14
Final R indices [I > 2σ(I)]R1 = 0.0474
wR2 = 0.1125		R1 = 0.0295
wR2 = 0.0757
Final R indices (all data)R1 = 0.0627
wR2 = 0.1211		R1 = 0.0362
wR2 = 0.0788
Goodness-of-fit on F21.0341.058
Largest diff. peak, hole/e·Å–30.48, –0.420.34, –0.44

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Inorganics 11 00259 g001 550
Figure 1. Co(II) coordination environment (a) and view of the {Co(DMF)2(odabco)2}n2n+ coordination layer along the b axis (b) in 1. Co atoms are purple, O atoms are red, N atoms are blue. H atoms and guest moieties are not shown. The black rectangle in Figure 1b shows a projection of a and c unit cell edges.
Figure 1. Co(II) coordination environment (a) and view of the {Co(DMF)2(odabco)2}n2n+ coordination layer along the b axis (b) in 1. Co atoms are purple, O atoms are red, N atoms are blue. H atoms and guest moieties are not shown. The black rectangle in Figure 1b shows a projection of a and c unit cell edges.
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Figure 2. Crystal packing of 1, view along the a axis. Each layer is shown in different colors. Dioxane molecules are shown in a space-filling mode. The black rectangle shows a projection of b and c unit cell edges (a). Closest molecular environment of perchlorate in 1. The Cl atom is green, H atoms are orange, and other atom designations match to Figure 2. Only the H atoms relevant to ClO4– binding are shown for clarity, and short H…O contacts are presented by orange dashed lines. The dioxane molecule and second O positions of the disordered perchlorate are shown as semi-transparent (b).
Figure 2. Crystal packing of 1, view along the a axis. Each layer is shown in different colors. Dioxane molecules are shown in a space-filling mode. The black rectangle shows a projection of b and c unit cell edges (a). Closest molecular environment of perchlorate in 1. The Cl atom is green, H atoms are orange, and other atom designations match to Figure 2. Only the H atoms relevant to ClO4– binding are shown for clarity, and short H…O contacts are presented by orange dashed lines. The dioxane molecule and second O positions of the disordered perchlorate are shown as semi-transparent (b).
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Figure 3. Carbon dioxide adsorption–desorption isotherms at 195 K for 1a (a) and 2a (b) (filled symbols for adsorption and open ones for desorption curves, respectively).
Figure 3. Carbon dioxide adsorption–desorption isotherms at 195 K for 1a (a) and 2a (b) (filled symbols for adsorption and open ones for desorption curves, respectively).
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Figure 4. Infrared spectra of dry samples 1, 2, 1a and 2a (a). Diffuse reflectance spectra of the dry 1 and 2, recalculated to K-M(λ) dependencies (b).
Figure 4. Infrared spectra of dry samples 1, 2, 1a and 2a (a). Diffuse reflectance spectra of the dry 1 and 2, recalculated to K-M(λ) dependencies (b).
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Figure 5. Temperature dependencies of the inversed magnetic susceptibility 1/χp(T) and effective magnetic moment μeff(T) for 1 (a) and 1a (b). The inset in (a) shows the low-T μeff(T) data on an enlarged scale.
Figure 5. Temperature dependencies of the inversed magnetic susceptibility 1/χp(T) and effective magnetic moment μeff(T) for 1 (a) and 1a (b). The inset in (a) shows the low-T μeff(T) data on an enlarged scale.
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Figure 6. Temperature dependencies of the inversed magnetic susceptibility χp–1(T) and effective magnetic moment μeff(T) for 2 (a) and 2a (b). The dashed lines shows the numerical fits to the μeff(T) data as described in the text.
Figure 6. Temperature dependencies of the inversed magnetic susceptibility χp–1(T) and effective magnetic moment μeff(T) for 2 (a) and 2a (b). The dashed lines shows the numerical fits to the μeff(T) data as described in the text.
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Table
Table 1. Parameters of porous structures of 1a and 2a.
Table 1. Parameters of porous structures of 1a and 2a.
SampleSpecific Surface Area/m2·g−1Vpore/cm3·g−1Vads(CO2) a/cm3(STP)·g−1
1a36.0 b/511 c0.007 b/0.103 a81.8
2a24.4 b/377 c0.006 b/0.076 a60.3
a measured at P/P0 = 0.95; b calculated for points before the adsorption step, for the closed phase; c calculated for points after the adsorption step, for the opened phase.
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Demakov, P.A.; Kovalenko, K.A.; Lavrov, A.N.; Fedin, V.P. Flexible Co(II)-and Ni(II)-Based Cationic 2D Metal–Organic Frameworks Based on a Charge-Neutral (O,O)-Donor Bridge. Inorganics 2023, 11, 259. https://doi.org/10.3390/inorganics11060259

AMA Style

Demakov PA, Kovalenko KA, Lavrov AN, Fedin VP. Flexible Co(II)-and Ni(II)-Based Cationic 2D Metal–Organic Frameworks Based on a Charge-Neutral (O,O)-Donor Bridge. Inorganics. 2023; 11(6):259. https://doi.org/10.3390/inorganics11060259

Chicago/Turabian Style

Demakov, Pavel A., Konstantin A. Kovalenko, Alexander N. Lavrov, and Vladimir P. Fedin. 2023. "Flexible Co(II)-and Ni(II)-Based Cationic 2D Metal–Organic Frameworks Based on a Charge-Neutral (O,O)-Donor Bridge" Inorganics 11, no. 6: 259. https://doi.org/10.3390/inorganics11060259

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