Cyclometalated [Os(C–N)x(N–N)3−x]m+ mimetics of tris(2,2′-bipyridine)osmium(ii): covering a 2 V potential range by known (x = 0, 1) and new (x = 2, 3) species (C–N = o-2-phenylpyridinato)

Abstract

Electrochemical studies of [Os(C–N)_x(N–N)_3−x]^m+ (1) consisting of known Os^II species with x = 0 (a) and 1 (b) and crystallographically characterized new Os^III bis- and tris-metalacycles with x = 2 (c) and 3 (d) (N–N = 2,2′-bipyridine, ⁻C–N = 2-phenylpyridinato) revealed a Nernstian behavior in MeCN. A stepwise replacement of neutral N–N ligands by three anionic C–N donors covers a 2 V potential range from −1 to +1 V vs. Ag/AgCl for the Os^III/Os^II feature.