SYNTHESIS AND THERMAL-BEHAVIOR OF ADDUCTS OF [MO(CN)8](3-) AND [W(CN)8](3-) WITH 8-HYDROXYQUINOLINE

The adducts of [Mo(CN)8]3- and [W(CN)8]3- with 8-hydroxyquinoline (oxine) synthesized were of the type K3[MO(CN)8].(C9H7ON)8.4H2O and K3[W(CN)8].(C9H7ON)6.3H2O. The FTIR spectra show the presence of the (CN) and oxine group in the adduct compounds through the peaks in the range 2047-2108 cm-1 and 1015-1461 cm-1 respectively. The lower region of FTIR spectra show the M=O stretching while the higher range to nu(N-H) and nu(OH) modes. The uncoordinated water in these adducts was removed at around 110-degrees-C in a single step. The decomposition of adduct compounds starts from 125-degrees-C and continues to higher temperatures upto 850-degrees-C in different stages. The second stage of decomposition was predominant with the removal of oxine molecules with the formation of polymeric oxide of the type K2O.M2O5 (where M=Mo or W) obtained as the pyrolysis product.