THERMAL DEHYDRATION OF HEXATHIOCYANATOBISMUTHATES(III) OF LANTHANIDES

The thermal dehydration of hexathiocyanatobismuthates(III) of lanthani des of the general formula Ln[Bi(SCN)6] . nH2O, where Ln is La, Ce, Pr , Nd, Sm, Gd, Dy, Er, Y and n is 3-5, has been examined. The thermal a nalysis curves of the complexes and the results of chemical and X-ray analyses of the products are presented. From these results, the mechan ism of the thermal dehydration was established. The reaction order and activation energy were calculated by the Coats-Redfern and Zsako meth ods.