SYNTHESIS, CHARACTERIZATION AND THERMAL-BEHAVIOR OF CYANO(OXINE)-MOLYBDENUM(IV) AND CYANO(OXINE)-TUNGSTEN(IV)

A new class of adduct compounds of octacyano-molybdate(IV) and -tungstate(IV) complexes with oxine, of the type K4[M(CN)8].8(C9H7ON).5H2O (where M = Mo or W) was synthesised. FTIR spectra show bands in the range 2000-2200 cm-1 and around 1120 cm-1, indicating the presence of the cyano group, -C = N, as well as oxine through the -N = O mode. The d spacing from the X-ray diffraction patterns were determined and compared with those of known compounds. Thermogravimetric analysis indicated the removal of uncoordinated water up to 150-degrees-C. Oxine and cyano molecules were removed stage by stage at higher temperatures. The final products from thermal treatment are oxides of polymeric nature. The kinetic parameters n and E(a) were determined by means of TGA and DTG thermograms.