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Dinuclear Complexes Formed by Hydrogen Bonds: Synthesis, Structure and Magnetic and Electrochemical Properties
Author(s) -
Granelli Matteo,
Downward Alan M.,
Huber Robin,
Guénée Laure,
Besnard Céline,
Krämer Karl W.,
Decurtins Silvio,
Liu ShiXia,
Thompson Laurence K.,
Williams Alan F.
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201700591
Subject(s) - chemistry , hydrogen bond , intramolecular force , crystallography , homonuclear molecule , heteronuclear molecule , ligand (biochemistry) , electrochemistry , inorganic chemistry , stereochemistry , molecule , nuclear magnetic resonance spectroscopy , organic chemistry , biochemistry , receptor , electrode
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 M II M II , mixed‐valent M II M III and heteronuclear M II 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.