Copper(II), Nickel(II), Cobalt(II), and Chromium(III) Complexes Based on 6,6′-Bis{[methyl(oxido)imino]methyl}-2,2′-bipyridine

Abstract

The bipyridine-based ligand 6,6'-bis{[methyl(oxido)imino]methyl}-2,2' -bipyridine (L) reacts with copper(II) chloride in methanol to produce a tetrachlorocuprate(II) salt [CuL][CuCl4] (1). Reactions of equimolar quantities of Ni(NO3)2 · 6H2O and Co(NO3)2 · 6H2O with L in methanol produce compounds [ML(NO3)2] (M = Ni (2), M = Co (3). Reaction of Cr(NO3)3 · 6H2O with L affords [Cr(L)(H2O)2](NO3)3 · 0.5H2O (4). The structures of compounds 1 - 4 were determined by X-ray diffraction. In all four complexes L exhibits the tetradentae chelating mode of coordination.