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

The reaction of pyridine-2-carbonitrile with copper(II), cobalt(II) and 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, Co-II, Ni-II, have been obtained under various reaction conditions. Their stereochemistry and the mode of ligand coordination have been determined by spectral, magnetic and conductometric measurements. The crystal 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 complexes is briefly discussed.