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Dinuclear Complexes Formed by Hydrogen Bonds: Synthesis, Structure and Magnetic and Electrochemical Properties

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Granelli Matteo, Downward Alan M., Huber Robin, Guénée Laure, Besnard Céline, Krämer Karl W., Decurtins Silvio, Liu Shi-Xia, Thompson Laurence K., Williams Alan F.,
Project New materials for honeycomb-lattice and single-ion magnets
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Original article (peer-reviewed)

Journal Chemistry - A European Journal
Volume (Issue) 23(29)
Page(s) 7104 - 7112
Title of proceedings Chemistry - A European Journal
DOI 10.1002/chem.201700591


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 MIIMII, mixed-valent MIIMIII and heteronuclear MIIM’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 hydrogenbonded structure.