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Search Results (6)

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Keywords = expanded terpyridine

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10 pages, 3132 KiB  
Communication
Interfacial Synthesis of an Electro-Functional 2D Bis(terpyridine)copper(II) Polymer Nanosheet
by Kenji Takada, Joe Komeda, Hiroaki Maeda, Naoya Fukui, Hiroyasu Masunaga, Sono Sasaki and Hiroshi Nishihara
Molecules 2025, 30(9), 2044; https://doi.org/10.3390/molecules30092044 - 4 May 2025
Viewed by 263
Abstract
Coordination polymers are attractive materials for various fields of practical application. The high degree of freedom of choice of metal ions and organic ligands plays a critical role in functional diversification. In the present study, we report the liquid–liquid interfacial synthesis of a [...] Read more.
Coordination polymers are attractive materials for various fields of practical application. The high degree of freedom of choice of metal ions and organic ligands plays a critical role in functional diversification. In the present study, we report the liquid–liquid interfacial synthesis of a 2D bis(terpyridine)copper(II) polymer thin film, Cu-tpy. The synthesized Cu-tpy was characterized by various microscopic observations such as TEM, SEM, and AFM, and spectroscopic measurements such as XPS, Raman spectroscopy, SEM/EDS, and UV–Vis spectroscopy. Synchrotron-radiated X-ray scattering confirmed that Cu-tpy was oriented crystalline films. Moreover, Cu-tpy showed electrochemical micro-supercapacitor behavior in the solid-state owing to its ionic nature. This study expands the potential of bis(terpyridine)metal(II) polymers as electro-functional materials. Full article
(This article belongs to the Special Issue Inorganic Chemistry in Asia)
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15 pages, 4833 KiB  
Article
Fluorescent Polymers via Coordination of bis-Terpyridine Ligands with Transition Metals and Their pH Response Properties
by Tao Zhang, Fengxue Liu, Yongxin Liu, Kaixiu Li, Zhengguang Li, Yaqin Li, Fan Fu, Mingliang Liu, Yiming Li, Die Liu and Pingshan Wang
Polymers 2025, 17(1), 87; https://doi.org/10.3390/polym17010087 - 31 Dec 2024
Viewed by 964
Abstract
Stimulus-responsive luminescent materials are pivotal in the field of sensing. Fluorescent transition metal complexes with a charge transfer excited state, especially terpyridine-coordinated polymers, are of particular interest due to their tunable emission. In this paper, a novel bis-terpyridine ligand was synthesized and assembled [...] Read more.
Stimulus-responsive luminescent materials are pivotal in the field of sensing. Fluorescent transition metal complexes with a charge transfer excited state, especially terpyridine-coordinated polymers, are of particular interest due to their tunable emission. In this paper, a novel bis-terpyridine ligand was synthesized and assembled into a coordination polymer, which showed intense visible light absorption and fluorescence emission in the solid state that could be regulated by an acidic or basic pH. After being protonated by acid, the fluorescence of the polymer P2 was quenched. The emission of the polymer split from 635 nm to two peaks of 674 and 440 nm, and then stabilized at 728 nm for 7 days, which showed a significant red-shift and good protonation stability. The fluorescence emission wavelength of the protonated polymers recovered after alkalization, and the fluorescence intensity of the polymer was greatly improved after alkalization, showing interesting acid–base-response luminescence characteristics. The sensitive response of the synthesized coordination polymers to acids and bases will contribute to expanding the application of linear coordination polymers in sensing and other fields. Full article
(This article belongs to the Special Issue Design, Synthesis and Application of Coordination-Driven Metal-Organic Supramolecular Polymers)
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23 pages, 8908 KiB  
Article
Synthesis, Electrochemistry and Density Functional Theory of Osmium(II) Containing Different 2,2′:6′,2″-Terpyridines
by Nandisiwe G. S. Mateyise, Marrigje M. Conradie and Jeanet Conradie
Molecules 2024, 29(21), 5078; https://doi.org/10.3390/molecules29215078 - 27 Oct 2024
Cited by 2 | Viewed by 1726
Abstract
In coordination chemistry, 2,2′:6′,2″-terpyridine is a versatile and extensively studied tridentate ligand. Terpyridine forms stable complexes with a variety of metal ions through coordination sites provided by the three nitrogen atoms in its pyridine rings. This paper presents an electrochemical study on various [...] Read more.
In coordination chemistry, 2,2′:6′,2″-terpyridine is a versatile and extensively studied tridentate ligand. Terpyridine forms stable complexes with a variety of metal ions through coordination sites provided by the three nitrogen atoms in its pyridine rings. This paper presents an electrochemical study on various bis(terpyridine)osmium(II) complexes, addressing the absence of a systematic investigation into their redox behavior. Additionally, a computational chemistry analysis was conducted on these complexes, as well as on eight previously studied osmium(II)-bipyridine and -phenanthroline complexes, to expand both the experimental and theoretical understanding. The experimental redox potentials, Hammett constants, and DFT-calculated energies show linear correlations due to the electron-donating or electron-withdrawing nature of the substituents, as described by the Hammett constants. These substituent effects cause shifts to lower or higher redox potentials, respectively. Full article
(This article belongs to the Special Issue Recent Advance in Transition Metal Complexes and Their Applications II)
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16 pages, 4620 KiB  
Article
Expanded Ligands Based upon Iron(II) Coordination Compounds of Asymmetrical Bis(terpyridine) Domains
by Dalila Rocco, Alessandro Prescimone, Catherine E. Housecroft and Edwin C. Constable
Molecules 2023, 28(1), 82; https://doi.org/10.3390/molecules28010082 - 22 Dec 2022
Cited by 1 | Viewed by 2299
Abstract
The synthesis and characterization of two tritopic ligands containing a 2,2′:6′,2″-terpyridine (tpy) metal binding domain and either a 3,2′:6′,3″- or a 4,2′:6′,4″-tpy domain are detailed. The synthetic routes to these ligands involved the [Pd(dppf)Cl2]-catalyzed coupling of a boronic ester-functionalized 2,2′:6′,2″-tpy with [...] Read more.
The synthesis and characterization of two tritopic ligands containing a 2,2′:6′,2″-terpyridine (tpy) metal binding domain and either a 3,2′:6′,3″- or a 4,2′:6′,4″-tpy domain are detailed. The synthetic routes to these ligands involved the [Pd(dppf)Cl2]-catalyzed coupling of a boronic ester-functionalized 2,2′:6′,2″-tpy with bromo-derivatives of 3,2′:6′,3″-tpy or 4,2′:6′,4″-tpy. The 2,2′:6′,2″-tpy domains of the tritopic ligands preferentially bind Fe2+ in reactions with iron(II) salts leading to the formation of two homoleptic iron(II) complexes containing two peripheral 3,2′:6′,3″-tpy or 4,2′:6′,4″-tpy metal-binding sites, respectively. These iron(II) complexes are potentially tetratopic ligands and represent expanded versions of tetra(pyridin-4-yl)pyrazine. Full article
(This article belongs to the Special Issue Exclusive Contributions by the Editorial Board Members (EBMs) of the Inorganic Chemistry Section of Molecules)
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10 pages, 3172 KiB  
Article
Photocatalytic Atom Transfer Radical Addition to Olefins Utilizing Novel Photocatalysts
by Errika Voutyritsa, Ierasia Triandafillidi, Nikolaos V. Tzouras, Nikolaos F. Nikitas, Eleftherios K. Pefkianakis, Georgios C. Vougioukalakis and Christoforos G. Kokotos
Molecules 2019, 24(9), 1644; https://doi.org/10.3390/molecules24091644 - 26 Apr 2019
Cited by 32 | Viewed by 6532
Abstract
Photocatalysis is a rapidly evolving area of research in modern organic synthesis. Among the traditional photocatalysts, metal-complexes based on ruthenium or iridium are the most common. Herein, we present the synthesis of two photoactive, ruthenium-based complexes bearing pyridine-quinoline or terpyridine ligands with extended [...] Read more.
Photocatalysis is a rapidly evolving area of research in modern organic synthesis. Among the traditional photocatalysts, metal-complexes based on ruthenium or iridium are the most common. Herein, we present the synthesis of two photoactive, ruthenium-based complexes bearing pyridine-quinoline or terpyridine ligands with extended aromatic conjugation. Our complexes were utilized in the atom transfer radical addition (ATRA) of haloalkanes to olefins, using bromoacetonitrile or bromotrichloromethane as the source of the alkyl group. The tailor-made ruthenium-based catalyst bearing the pyridine-quinoline bidentate ligand proved to be the best-performing photocatalyst, among a range of metal complexes and organocatalysts, efficiently catalyzing both reactions. These photocatalytic atom transfer protocols can be expanded into a broad scope of olefins. In both protocols, the photocatalytic reactions led to products in good to excellent isolated yields. Full article
(This article belongs to the Special Issue Photocatalytic Strategies in Organic Synthesis)
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37 pages, 6274 KiB  
Review
Ddpd as Expanded Terpyridine: Dramatic Effects of Symmetry and Electronic Properties in First Row Transition Metal Complexes
by Christoph Förster, Matthias Dorn, Thomas Reuter, Sven Otto, Güllü Davarci, Tobias Reich, Luca Carrella, Eva Rentschler and Katja Heinze
Inorganics 2018, 6(3), 86; https://doi.org/10.3390/inorganics6030086 - 27 Aug 2018
Cited by 45 | Viewed by 10918
Abstract
The 2,2′:6′:2″-terpyridine ligand has literally shaped the coordination chemistry of transition metal complexes in a plethora of fields. Expansion of the ligand bite by amine functionalities between the pyridine units in the tridentate N,N’-dimethyl-N,N’-dipyridine-2-yl-pyridine-2,6-diamine ligand (ddpd) [...] Read more.
The 2,2′:6′:2″-terpyridine ligand has literally shaped the coordination chemistry of transition metal complexes in a plethora of fields. Expansion of the ligand bite by amine functionalities between the pyridine units in the tridentate N,N’-dimethyl-N,N’-dipyridine-2-yl-pyridine-2,6-diamine ligand (ddpd) modifies the properties of corresponding transition metal complexes, comprising redox chemistry, molecular dynamics, magnetism and luminescence. The origins of these differences between ddpd and tpy complexes will be elucidated and comprehensively summarized with respect to first row transition metal complexes with d2–d10 electron configurations. Emerging applications of these ddpd complexes complementary to those of the well-known terpyridine ligand will be highlighted. Full article
(This article belongs to the Special Issue First-Row Transition Metal Complexes)
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