Synthesis and 183W NMR Characterization of a-K7GaW11(TiO2)O39×11H2O Heteropolyanion

摘要

The peroxotitanium-substituted heteropolytungstate a-K7GaW11(TiO2)O39×11H2O has been synthesized and characterized by elemental analysis, IR, UV, 183W NMR and electrochemistry. 183W NMR spectrum consists of six lines with intensity ratio 2:2:1:2:2:2, indicated that the TiO2 occupied the empty octahedral site of the GaW11 anion forming a polyanion with Cs symmetry. The characteristic charge-transfer absorption band O22-?Ti at 385 nm occurs in the UV spectrum. The polarographic reduction potential of O22- at ca.+0.87 V has been found.