PHOTO-CATALYZED SYNTHESIS, CHARACTERIZATION AND THERMAL-BEHAVIOR OF THE ADDUCTS OF 8-HYDROXYQUINOLINE WITH THE PHOTOPRODUCTS OF OCTACYANOMOLYBDATE(IV) AND OCTACYANOTUNGSTATE(IV) WITH 1,2,3-BENZOTRIAZOLE AND TRIETHYLENETETRAMINE

The 8-hydroxyquinoline adducts and complexes of molybdenum(IV) and tungsten(IV) of the type K-2[Mo(CN)(OH)(O-2)(C6H5N3)(C9H7ON)]. 2C(9)H(7)ON). 2C(9)H(7)ON . H2O [I], K-2[W(O-2)(O)(C9H7ON)(3)] [II] and K-3[W(CN)(2)(O-2)(OH)C9H7ON]. 2C(9)H(7)ON . 2H(2)O [III] have been: synthesised starting from the octacyanomolybdate(IV) or -tungstate(IV) by exposure to W light in the ligand field band in the presence of 1,2,3-benzotriazole or triethylenetetramine. The LR spectra of the complexes I and III show a strong band of nu C=N stretching in the range 2100-2150 cm(-1). The oxine group nu(C - O) in the complexes I, II and III is represented by a strong peak in the range 1100-1140 cm(-1). The lower region of the LR spectra shows M = O stretching while the higher range the nu(N - H) and nu(OH) modes. The thermal decomposition of the complexes starts from 160 degrees C with the removal of uncoordinated water and continues up to 800 degrees C. Oxine and cyano groups are removed stage by stage. The final products from the thermal treatment are oxides of the type K2O . MO(3) (where M = Mo, W). The kinetic parameters, viz., order of reaction (n) and activation energy (E(a)) have been determined using TG curves.