Dinuclear Complexes Formed by Hydrogen Bonds: Synthesis, Structure and Magnetic and Electrochemical Properties
| Autor: | Karl Krämer, Alan M. Downward, Laurence K. Thompson, Laure Guénée, Alan F. Williams, Matteo Granelli, Robin Huber, Céline Besnard, Shi-Xia Liu, Silvio Decurtins |
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| Rok vydání: | 2017 |
| Předmět: |
010405 organic chemistry
Hydrogen bond Ligand Chemistry Organic Chemistry Inorganic chemistry General Chemistry 010402 general chemistry Electrochemistry 01 natural sciences Catalysis Homonuclear molecule 0104 chemical sciences Metal Crystallography Electron transfer Heteronuclear molecule visual_art Intramolecular force 540 Chemistry visual_art.visual_art_medium 570 Life sciences biology |
| Zdroj: | Chemistry - A European Journal. 23:7104-7112 |
| ISSN: | 0947-6539 |
| DOI: | 10.1002/chem.201700591 |
| Popis: | The synthesis is reported of a series of homo- and hetero-dinuclear octahedral complexes of the ligand 1, 1,2-bis(1-methyl-benzimidazol-2-yl) ethanol, where the two metal centres are linked by hydrogen bonds between coordinated alcohols and coordinated alkoxides. Homonuclear divalent MII MII , mixed-valent MII MIII and heteronuclear MII M'III species are prepared. The complexes have been characterised by X-ray crystallography and show unusually short O⋅⋅⋅O distances for the hydrogen bonds. Magnetic measurements show the hydrogen-bond bridges can lead to ferromagnetic or antiferromagnetic coupling. The electrochemistry of the dinuclear species is significantly different from the mononuclear systems: the latter show irreversible waves in cyclic voltammograms as a result of the need to couple proton and electron transfer. The dinuclear species, in contrast, show reversible waves, which are attributed to rapid intramolecular proton transfer facilitated by the hydrogen-bonded structure. |
| Databáze: | OpenAIRE |
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