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 decomposition process. The orders, n, the activation energies, E, the pre-exponential factor, A, and the entropies, ΔS of the thermal decomposition reactions have been derived from thermogravimetric (TG) and differential thermogravimetric (DTG) curves. The characterisation of the end products of the decomposition was achieved by X-ray diffraction. UV–Vis and IR spectra were used for the investigation of characteristic absorption bands and the structural characterisation of ligand and the metals, respectively. Using the Coats and Redfern and Horowitz and Metzger methods performed kinetic analysis of the thermogravimetric data.