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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][CuCl 4 ] (1). Reactions of equimolar quantities of Ni(NO 3 ) 2  · 6H 2 O and Co(NO 3 ) 2  · 6H 2 O with L in methanol produce compounds [ML(NO 3 ) 2 ] (M = Ni (2), M = Co (3). Reaction of Cr(NO 3 ) 3  · 6H 2 O with L affords [Cr(L)(H 2 O) 2 ](NO 3 ) 3  · 0.5H 2 O (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.

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