PHOTOCATALYZED SYNTHESIS, CHARACTERIZATION AND THERMAL-BEHAVIOR OF MOLYBDENUM(IV) AND TUNGSTEN(IV) COMPLEXES WITH OXINE

The synthesis of adducts and complexes of molybdenum and tungsten with 8-hydroxyquinoline (oxine) starting from octacyanomolybdate(IV) and octacyanotungstate(IV) on exposure to UV irradiation in the ligand field bands was carried out. The intermediate red products, the heptacyano complexes of molybdenum(V) and tungsten(V), obtained by primary photochemical reaction, form adducts with 8-hydroxyquinoline as shown by the strong peak in the range 2200-2000 cm-1 due to -C=N stretching and by another peak in the range 1150-1100 cm-1 for the v(C-O) stretching mode of 8-hydroxyquinoline. The final blue photolysis product reacts with oxine, with the removal of the remaining cyano groups and formation of the final complex with the latter. The thermal behaviour of these adducts and complexes were studied.