Thermal studies of Ni(II), Pd(II), Pt(II) and Ru(III) complexes of N,N-dihexyl-N '-benzoylthiourea

Some metal complexes of N,N-dihexyl-N'-benzoylthiourea (DHBT) of the type M (DHBT)(n) [ M = Ni, Pd, Pt, (n = 2), Ru, (n = 3)] have been synthesised and studied using DTA and TG. These complexes undergo only the pyrolytic decom position process. The orders, n, the activation energies, E, the pre-expone ntial factor, A, and the entropies, Delta S of the thermal decomposition re actions have been derived from thermogravimetric (TG) and differential ther mogravimetric (DTG) curves. The characterisation of the end products of the decomposition was achieved by X-ray diffraction. UV-Vis and IR spectra wer e used for the investigation of characteristic absorption bands and the str uctural characterisation of ligand and the metals, respectively Using the C oats and Redfern and Horowitz and Metzger methods performed kinetic analysi s of the thermogravimetric data. (C) 2000 Elsevier Science B.V. All rights reserved.