Dinuclear copper(II) complexes of N,N ',N '',N '''-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane and some N,S or N,O bidentate ligands

Four new mixed complexes of Cu(II) with tpmc (N,N',N ",N"'-tetrakis(2-pyrid ylmethyl)-1,4,8,11-tetraazacyclotetradecane) and bridged bound N,S or N,O l igands of the general formula [Cu-2(X)tpmc](ClO4)(4), where X = thiosemicar bazide (tsc), semicarbazide (sc), thiourea (tu) or urea (II), were prepared . Elemental and thermal analyses, conductometric and magnetic measurements, electronic, IR and mass spectroscopy have been employed. The molar conduct ivity values in acetonitrile show a behavior of 1:4 electrolytes. IR studie s clearly indicate that X ligand is coordinated via N, S (tsc and tu) or N, O (se and II) atoms, acting as bidentate bridging ligands. An exo coordina tion of Cu(II) ions and tpmc was proposed. Thermal decomposition of the com plexes was performed. The mass decomposition pathways are proposed. Finally , the obtained complexes exhibit microbiological activity against some bact eria.