Scientific article
English

Control of Redox Potential by Deprotonation of Coordinated 1H-Imidazole in Complexes of 2-(1H-Imidazol-2-yl)pyridine

Published inHelvetica Chimica Acta, vol. 88, no. 3, p. 487-495
Publication date2005
Abstract

Complexes [ML₃]²⁺ of the bidentate ligand 2‐(1H‐imidazol‐2‐yl)pyridine were prepared with iron(II), cobalt(II), and ruthenium(II). The electronic spectra suggest the ligand to be a weaker σ‐donor and π‐acceptor than the closely related 2,2′‐bipyridine. The complexes are readily deprotonated by addition of base, and the effect of the deprotonation is to lower the MIII/MII redox potential by roughly 900 mV. This is roughly 75% of the drop observed for related complexes of 2,6‐di‐1H‐imidazol‐2‐ylpyridine, and suggests the effect to be largely coulombic in origin.

Citation (ISO format)
STUPKA, Gilles, GREMAUD, Ludovic, WILLIAMS, Alan Francis. Control of Redox Potential by Deprotonation of Coordinated 1H-Imidazole in Complexes of 2-(1H-Imidazol-2-yl)pyridine. In: Helvetica Chimica Acta, 2005, vol. 88, n° 3, p. 487–495. doi: 10.1002/hlca.200590033
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Additional URL for this publicationhttp://doi.wiley.com/10.1002/hlca.200590033
Journal ISSN0018-019X
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