Journal
HELVETICA CHIMICA ACTA
Volume 88, Issue 3, Pages 487-495Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/hlca.200590033
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Complexes [ML3](2+) of the bidentate ligand 2-(1H-imidazol-2-yl)pyridine were prepared with iron(II), cobalt(II), and ruthenium(II). ne electronic spectra suggest the ligand to be a weaker sigma-donor and pi-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 M-III/M-II 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.
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