Coordination Compounds of Cobalt, Nickel, and Copper with Isonitrosoacetone Benzoylhydrazone

摘要

Benzoylhydrazine and isonitrosoacetone react in ethanol with cobalt, nickel, and copper halides and acetates to give the coordination compounds MX_2(HL) ·nH_2O, MX_2(HL)_2·nH_2O, and ML_2·nH_2O[M = Co, Ni, Cu; X = Cl, Br; HL = C_6H_5C(O)NHNC(CH_3)CHNOH; n = 1-4]. The same reactions performed in the presence of sodium acetate and pyridine (pH 7-8) yield the complexes MLCl·nH_2O and MPy_2LCl·nH_2O (n = 1-4). All the complexes have a pseudooctahedral coordination geometry. The hydrazone HL behaves as a tridentate O,N,N-donor ligand. Thermolysis of the substances involves dehydration (70-90 deg C), deaquation (155-170 deg C) or deamination (175-195 deg C), and complete thermal decomposition (285-360 deg C).