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Inverse Coordination Chemistry

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Inorganic Chemistry".

Deadline for manuscript submissions: closed (20 October 2021) | Viewed by 9050

Special Issue Editor


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Guest Editor
Department of Chemistry, Babes-Bolyai University, 1 Kogalniceanu street, RO-400084 Cluj-Napoca, Romania

Special Issue Information

Dear Colleagues,

This Special Issue is devoted to inverse coordination complexes, i.e. metal compounds displaying an arrangement of acceptor and donor sites opposite to that occurring in traditional coordination complexes.

The inverse coordination complexes consist of a nonmetallic coordination center, surrounded by a number of metal atoms which can be further connected (or not) by internal bridging linkers and peripheral (or terminal) ligands. As coordination centers may serve isolated non-metal atoms (oxygen, other chalcogens, halogens, nitrogen, phosphorus, arsenic, antimony), or centroligands such as polyhomoatomic molecules or anions, (e.g. dinitrogen, azide, polyphosphanes, polyarsanes), organic heteroatom molecules (e.g. nitrogen- or oxygen- heterocycles, exodonor crown ethers, etc.) or inorganic oxoanions (e.g. carbonate, sulfate, phosphate, etc.). Sometimes, the coordination centers are described as polyatomic bridging ligands, but they deserve recognition for their structure directing role, more important than just bridging.

The novel inverse coordination concept reveals a new face of coordination chemistry, illustrated for compounds with chalcogens, halogens, and nitrogen as coordination centers and was promoted in a series of extensive reviews [I. Haiduc, Coord. Chem. Rev., 338, 1 (2017); 348, 71 (2017); J. Coord. Chem., 71, 3139 (2018); 72, 35 (2019); 72, 2127 (2019); 72, 2805 (2019)); 73, 1619 (2020); I. Haiduc, E.R.T. Tiekink. Inverse Coordination. A Novel Chemical Concept, Sunway University Press, Selangor, Malaysia (2020)] which reveal an astonishing diversity of compositions and topologies.

In this Special Issue, we invite researchers who have published before original research on inverse coordination complexes as well as new authors, to contribute to the consolidation of this novel chapter of coordination chemistry with publication of relevant work.

Prof. Dr. Ionel Haiduc
Guest Editor

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Keywords

  • inverse coordination
  • centroligands
  • coordination center
  • oxygen, chalcogens
  • halogens
  • nitrogen
  • heterocycle
  • phosphorus
  • arsenic
  • inorganic oxoanions
  • crown ethers

Published Papers (4 papers)

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Research

14 pages, 1897 KiB  
Article
A New Synthetic Methodology in the Preparation of Bimetallic Chalcogenide Clusters via Cluster-to-Cluster Transformations
by Yu-Jie Zhong, Jian-Hong Liao, Tzu-Hao Chiu, Yuh-Sheng Wen and C. W. Liu
Molecules 2021, 26(17), 5391; https://doi.org/10.3390/molecules26175391 - 5 Sep 2021
Cited by 3 | Viewed by 1985
Abstract
A decanuclear silver chalcogenide cluster, [Ag10(Se){Se2P(OiPr)2}8] (2) was isolated from a hydride-encapsulated silver diisopropyl diselenophosphates, [Ag7(H){Se2P(OiPr)2}6], under thermal condition. The time-dependent [...] Read more.
A decanuclear silver chalcogenide cluster, [Ag10(Se){Se2P(OiPr)2}8] (2) was isolated from a hydride-encapsulated silver diisopropyl diselenophosphates, [Ag7(H){Se2P(OiPr)2}6], under thermal condition. The time-dependent NMR spectroscopy showed that 2 was generated at the first three hours and the hydrido silver cluster was completely consumed after thirty-six hours. This method illustrated as cluster-to-cluster transformations can be applied to prepare selenide-centered decanuclear bimetallic clusters, [CuxAg10-x(Se){Se2P(OiPr)2}8] (x = 0–7, 3), via heating [CuxAg7−x(H){Se2P(OiPr)2}6] (x = 1–6) at 60 °C. Compositions of 3 were accurately confirmed by the ESI mass spectrometry. While the crystal 2 revealed two un-identical [Ag10(Se){Se2P(OiPr)2}8] structures in the asymmetric unit, a co-crystal of [Cu3Ag7(Se){Se2P(OiPr)2}8]0.6[Cu4Ag6(Se){Se2P(OiPr)2}8]0.4 ([3a]0.6[3b]0.4) was eventually characterized by single-crystal X-ray diffraction. Even though compositions of 2, [3a]0.6[3b]0.4 and the previous published [Ag10(Se){Se2P(OEt)2}8] (1) are quite similar (10 metals, 1 Se2−, 8 ligands), their metal core arrangements are completely different. These results show that different synthetic methods by using different starting reagents can affect the structure of the resulting products, leading to polymorphism. Full article
(This article belongs to the Special Issue Inverse Coordination Chemistry)
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14 pages, 4497 KiB  
Article
Doubling the Carbonate-Binding Capacity of Nanojars by the Formation of Expanded Nanojars
by Wisam A. Al Isawi and Gellert Mezei
Molecules 2021, 26(11), 3083; https://doi.org/10.3390/molecules26113083 - 21 May 2021
Cited by 4 | Viewed by 1793
Abstract
Anion binding and extraction from solutions is currently a dynamic research topic in the field of supramolecular chemistry. A particularly challenging task is the extraction of anions with large hydration energies, such as the carbonate ion. Carbonate-binding complexes are also receiving increased interest [...] Read more.
Anion binding and extraction from solutions is currently a dynamic research topic in the field of supramolecular chemistry. A particularly challenging task is the extraction of anions with large hydration energies, such as the carbonate ion. Carbonate-binding complexes are also receiving increased interest due to their relevance to atmospheric CO2 fixation. Nanojars are a class of self-assembled, supramolecular coordination complexes that have been shown to bind highly hydrophilic anions and to extract even the most hydrophilic ones, including carbonate, from water into aliphatic solvents. Here we present an expanded nanojar that is able to bind two carbonate ions, thus doubling the previously reported carbonate-binding capacity of nanojars. The new nanojar is characterized by detailed single-crystal X-ray crystallographic studies in the solid state and electrospray ionization mass spectrometric (including tandem MS/MS) studies in solution. Full article
(This article belongs to the Special Issue Inverse Coordination Chemistry)
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12 pages, 2616 KiB  
Communication
Coordination Behavior of [Cp″2Zr(µ1:1-As4)] towards Lewis Acids
by Veronika Heinl, Gábor Balázs, Sarah Koschabek, Maria Eckhardt, Martin Piesch, Michael Seidl and Manfred Scheer
Molecules 2021, 26(10), 2966; https://doi.org/10.3390/molecules26102966 - 17 May 2021
Cited by 1 | Viewed by 1923
Abstract
The functionalization of the arsenic transfer reagent [Cp″2Zr(η1:1-As4)] (1) focuses on modifying its properties and enabling a broader scope of reactivity. The coordination behavior of 1 towards different Lewis-acidic transition metal complexes and main group [...] Read more.
The functionalization of the arsenic transfer reagent [Cp″2Zr(η1:1-As4)] (1) focuses on modifying its properties and enabling a broader scope of reactivity. The coordination behavior of 1 towards different Lewis-acidic transition metal complexes and main group compounds is investigated by experimental and computational studies. Depending on the steric requirements of the Lewis acids and the reaction temperature, a variety of new complexes with different coordination modes and coordination numbers could be synthesized. Depending on the Lewis acid (LA) used, a mono-substitution in [Cp″2Zr(µ,η1:1:1:1-As4)(LA)] (LA = Fe(CO)4 (4); B(C6F5)3 (7)) and [Cp″2Zr(µ,η3:1:1-As4)(Fe(CO)3)] (5) or a di-substitution [Cp″2Zr(µ31:1:1:1-As4)(LA)2] (LA = W(CO)5 (2); CpMn(CO)2 (3); AlR3 (6, R = Me, Et, iBu)) are monitored. In contrast to other coordination products, 5 shows an η3 coordination in which the butterfly As4 ligand is rearranged to a cyclo-As4 ligand. The reported complexes are rationalized in terms of inverse coordination. Full article
(This article belongs to the Special Issue Inverse Coordination Chemistry)
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19 pages, 4512 KiB  
Article
Ferro- and Antiferromagnetic Interactions in Oxalato-Centered Inverse Hexanuclear and Chain Copper(II) Complexes with Pyrazole Derivatives
by Isabel Castro, M. Luisa Calatayud, Marta Orts-Arroyo, Nicolás Moliner, Nadia Marino, Francesc Lloret, Rafael Ruiz-García, Giovanni De Munno and Miguel Julve
Molecules 2021, 26(9), 2792; https://doi.org/10.3390/molecules26092792 - 10 May 2021
Cited by 5 | Viewed by 2227
Abstract
Two novel copper(II) complexes of formulas {[Cu(4-Hmpz)4][Cu(4-Hmpz)23-ox-κ2O1,O2:κO2′:κO1′)(ClO4)2]}n (1) and {[Cu(3,4,5-Htmpz)4]2[Cu(3,4,5-Htmpz)2 [...] Read more.
Two novel copper(II) complexes of formulas {[Cu(4-Hmpz)4][Cu(4-Hmpz)23-ox-κ2O1,O2:κO2′:κO1′)(ClO4)2]}n (1) and {[Cu(3,4,5-Htmpz)4]2[Cu(3,4,5-Htmpz)23-ox-κ2O1,O2:κO2′:κO1′)(H2O)(ClO4)]2[Cu2(3,4,5-Htmpz)4(µ-ox-κ2O1,O2:κ2O2′,O1′)]}(ClO4)4·6H2O (2) have been obtained by using 4-methyl-1H-pyrazole (4-Hmpz) and 3,4,5-trimethyl-1H-pyrazole (3,4,5-Htmpz) as terminal ligands and oxalate (ox) as the polyatomic inverse coordination center. The crystal structure of 1 consists of perchlorate counteranions and cationic copper(II) chains with alternating bis(pyrazole)(µ3-κ2O1,O2:κO2′:κO1′-oxalato)copper(II) and tetrakis(pyrazole)copper(II) fragments. The crystal structure of 2 is made up of perchlorate counteranions and cationic centrosymmetric hexanuclear complexes where an inner tetrakis(pyrazole)(µ-κ2O1,O2:κ2O2′,O1′-oxalato)dicopper(II) entity and two outer mononuclear tetrakis(pyrazole)copper(II) units are linked through two mononuclear aquabis(pyrazole)(µ3-κ2O1,O2:κO2′:κO1′-oxalato)copper(II) units. The magnetic properties of 1 and 2 were investigated in the temperature range 2.0–300 K. Very weak intrachain antiferromagnetic interactions between the copper(II) ions through the µ3-ox-κ2O1,O2:κO2′:κO1′ center occur in 1 [J = −0.42(1) cm−1, the spin Hamiltonian being defined as H = −J∑S1,i · S2,i+1], whereas very weak intramolecular ferromagnetic [J = +0.28(2) cm−1] and strong antiferromagnetic [J’ = −348(2) cm−1] couplings coexist in 2 which are mediated by the µ3-ox-κ2O1,O2:κO2′:κO1′ and µ-ox-κ2O1,O2:κ2O2′,O1′ centers, respectively. The variation in the nature and magnitude of the magnetic coupling for this pair of oxalato-centered inverse copper(II) complexes is discussed in the light of their different structural features, and a comparison with related oxalato-centered inverse copper(II)-pyrazole systems from the literature is carried out. Full article
(This article belongs to the Special Issue Inverse Coordination Chemistry)
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