METHANOLYSIS OF PYRIDINE-2-CARBONITRILE IN THE COORDINATION SPHERE OFCOPPER(II), COBALT(II) AND NICKEL(II) - THE STRUCTURE OF I(O-METHYLPYRIDINE-2-CARBOXIMIDATE)(3)]BR-2.4H(2)O

The reaction of pyridine-2-carbonitrile with copper(II), cobalt(II) an d nickel(II) salts in methanol solution led to the formation of solid complexes containing O-methylpyridine-2-carboximidate as a ligand (L). Seventeen compounds with general formulae [MX(2)L], [MXL(2)]X, [MX(2) L(2)] Or [ML(3)]X(2), where X = Br-, Cl-, NCS-, ClO4- and M = Cu-II, C o-II, Ni-II, have been obtained under various reaction conditions. The ir stereochemistry and the mode of ligand coordination have been deter mined by spectral, magnetic and conductometric measurements. The cryst al structure of [Ni(O-methylpyridine-2-carboximidate)(3)]Br-2 . 4H(2)O was determined by X-ray diffraction techniques. The influence of the metal(II) atom on the composition and the stereochemistry of solid com plexes is briefly discussed.