Thermal stability and kinetic studies of new dinuclear copper(II) complexes with octaazamacrocyclic and multidonor bidentate ligands

The thermal properties of four copper(II) complexes with N,N',N",N"'-tetrak is(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane (tpmc) and several bi dentate ligands N,S (thiosemicarbazide and thiourea) or N,O donors (semicar bazide and urea), of the general formula [Cu-2(X)tpmc](ClO4)(4), have been investigated by thermogravimerry (TCT) and differential scanning calorimetr y (DSC). The thermal stability order can be recognized for the examined com plexes, depending on coordinated bidentate bridging N,S or N,O ligand. Kine tic data demonstrated first-order thermal decomposition. A plausible mechan ism has been proposed which explains the major products of the degradation. (C) 2001 Elsevier Science B.V. All rights reserved.