Thermal Analysis Studies on Hydroxobridged Homo and Hetero Trinuclear Cobalt(III) Complexes

The synthesis and thermal analysis studies of several hydroxobridged homo and hetero trinuclear cobalt(III) complexes are reported. The complexes are of the type [M(H2O)x{(OH)2Co(en)2}2](SO4)2nH2O and [M(H2O)x{(OH)2Co(NH3)4}2](SO4)2nH2O where en denotes ethylenediamine and M =Co(II), Ni(II), Cu(II) and Zn(II) with x=0 for Cu(II), and 2 for other metal ions, and n =3, 4 or 5. The TG and DTA studies of these compounds show that one or more intermediate compounds are formed in each case before the metal oxides are produced.