Thermal-Behavior And Crystal-Structure Of Dichloro[6-Amino-1,3-Dimethyl-5-(2-Chlorophenylazo)Uracilato]Gold(Iii)

Abstract The title compound was obtained by reacting HAuCl 4 with the uracil derivative in ethanol. X-ray work ( P 2 1 / c , a =11.896(6), b =12.331(5), c = 13.501(4) A, β=121.46(3)°, R =0.038, 2096 observed reflections) shows that the crystal contains individual complex molecules in which the metal has a slightly distorted square-planar coordination. Two cis corners are occupied by Cl ligands. The uracil derivative forms a six-membered chelate ring via the deprotonated amino group and the phenyl- substituted nitrogen atom of the azo group. The thermal behavior of the free ligand and its Au complex has been determined from thermogravimetric and differential scanning calorimetric measurements.