Syntheses, Structures and Properties of Copper(ii) and Cobalt(ii) Complexes With 1-(4-Chlorophenyl)piperazinium Cations

Halide complexes of copper(II) and cobalt(II) compositions (HL)[CuCl] · HO (I), (HL)[CuCl] (II), (HL)[CoCl] · (HL)Cl · xHO (where x = 1.5 (III) or 2 (single crystal)) and (HL)[Cu(HO)Br] (IV), L = 1-(4-chlorophenyl)piperazine has been synthesized. Two different [CuCl] anions were found in the structure I, bound to organic cations and crystal water molecules by a network of hydrogen bonds. In compound II, the [CuCl] anion is completed to a distorted square pyramid, forming polymer chains. III is a mixed salt with the tetrahedral anion [CoCl]. Thermal analysis data show that compound I loses water (~70°C) and HCl (~158°C), melting and subsequent decomposition occurs at 178°C. Compound II exhibits incongruent melting at 178°C with transition to the exothermic stage of destruction. The similarity of the thermal behavior of I and II at 178°C indicates the formation of II after the removal of volatile components from compound I. Complex III is thermally resistant to 70°C, with a total mass loss of 20% to 300°C corresponding to the removal of all water molecules and 3 HCl per formula unit. Compound IV melts above 80°C without loss of mass, decomposition is observed when heated above 150°C.