THERMOGRAVIMETRIC AND SPECTROSCOPIC STUDIES ON LA(III) AND CE(III) COMPLEXES WITH SOME THIO-SCHIFF BASES

Solid complexes of five derivatives of thio-Schiff bases with La(III) and Ce(III) ions were prepared and characterized by elemental and ther mogravimetric analyses. The suggested general formula of the solid com plexes is [ML2(H2O)X].2H2O, where M = trivalent lanthanide ion, L = Sc hiff base and X = Cl- or ClO4-. Information about the water of hydrati on, the coordinated water molecules, the coordination chemistry and th e thermal stability of these complexes was obtained and is discussed. Additionally, a general scheme of thermal decomposition of the lanthan ide-Schiff base complexes is proposed.