Thermal studies on solid complexes of uracil with some divalent transitionmetal ions

The thermal behaviour of Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd (II) and Pd(II) complexes of uracil was studied by TG, DTG and DTA in a dyn amic nitrogen atmosphere. Two processes occur in the isolated uracil comple xes: dehydration and pyrolytic decomposition. In the hydrated complexes, th e first stage observed was the loss of water molecules, which was followed by decomposition of the uracil. The thermal dehydration of the complexes oc curred in from one to three steps. The final decomposition products were fo und to be the respective metal oxides, except in the cases of the Co(II) an d Pd(II) complexes, which produced metallic cobalt and palladium, respectiv ely. The order of reaction and energy of activation for the dehydration sta ge were evaluated.