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 · 0.5H 2O (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. © 2008 Verlag der Zeitschrift für Naturforschung, Tübingen.