PYRIDINE-TYPE COMPLEXES OF TRANSITION-METAL HALIDES .4. PREPARATION AND THERMAL STUDIES ON SOME NEW COMPLEXES OF NICKEL(II)-HALIDES FORMED WITH 2-METHYL-PYRIDINES, 3-METHYL-PYRIDINES, AND 4-METHYL-PYRIDINES

Formation of nitrogen ligated complexes of types NiL6X2, NiL4X2, NiL2X 2 and NiL1X2 (where L = pyridine, 2-, 3- and 4-methyl-pyridine and X = F, Cl, Br, I) have been studied by traditional preparative methods, i .e. from solutions and by solid-gas phase chemisorption. Quaternary mi xed complexes were obtained by chemisorption from heated intermediates . The complexes thus formed were further analysed by simultaneous TG-D TG-DTA. Effects of the ligands on stoichiometry and thermal properties of the complexes are discussed.