Dinuclear copper(II) complexes of N,N′,N′,N‴-Tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclote tradecane and some N,S or N,O Bidentate Ligands

Abstract

Four new mixed complexes of Cu(II) with tpmc (N,N′,N″,N‴-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclot etradecane) and bridged bound N,S or N,O ligands of the general formula [Cu 2 (X)tpmc](ClO 4 ) 4 , where X = thiosemicarbazide (tsc), semicarbazide (sc), thiourea (tu) or urea (u), were prepared. Elemental and thermal analyses, conductometric and magnetic measurements, electronic. IR and mass spectroscopy have been employed. The molar conductivity values in acetonitrile show a behavior of 1:4 electrolytes. IR studies clearly indicate that X ligand is coordinated via N, S (tsc and tu) or N, O (sc and u) atoms, acting as bidentate bridging ligands. An exo coordination of Cu(II) ions and tpmc was proposed. Thermal decomposition of the complexes was performed. The mass decomposition pathways are proposed. Finally, the obtained complexes exhibit microbiological activity against some bacteria.