Spectral and thermal properties of copper(II) complexes with methyl-3-pyridyl carbamate

Thermogravimetry (TG), differential thermal analysis (DTA), infrared (IR), electronic, EPR spectra and other analytical methods have been applied to t he investigation of the thermal behaviour and structure of the compounds [C u(ac)(2)(mpc)](2). 2CH(3)OH (I), Cu(Clac)(2)(mpc) (II), Cu(Cl(2)ac)(2)(mpc) (2) (III) and Cu(Cl(3)ac)(2)(mpc)(2) (IV) (where ac = CH3COO-, Clac = ClCH2 COO-, Cl(2)ac = Cl2CHCOO-, Cl(3)ac = Cl3CCOO- and mpc methyl-3-pyridyl carb amate). The solid phase intermediate and resultant products of thermolysis had been identified. The possible scheme of decomposition of the complexes is suggested with as a final product, CuO. IR data suggest a unidentate coo rdination of carboxylate to copper(II). Methyl-3-pyridyl carbamate was coor dinated through nitrogen atom of its heterocyclic ring in complexes I-IV. E PR spectra suggest a dimeric structure of complex I and monomeric structure of complexes II-IV.