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

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Published in Helvetica Chimica Acta. 2005, vol. 88, no. 3, p. 487-495
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.
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Other version: http://doi.wiley.com/10.1002/hlca.200590033
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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 https://archive-ouverte.unige.ch/unige:118540

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Deposited on : 2019-05-31

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