铜取代Dawson结构杂多钨磷酸电荷转移配合物的合成与性质研究

Two new charge-transfer complexes, (DMAH)₁₀［CuP₂W₁₇O₆₂］·DMF·2H₂O and (DMAH)₁₄［Cu₂P₂W₁₆O₆₂］ have been prepared in aqueous solution from N,N′-dimethylaniline(DMA) and copper substituted polyoxotungstates with Dawson Structure, and characterized by elemental analysis, ICP, TG, IR, diffusion reflectance electronic spectra, polarography, and CV. The results indicate that the structure of anion has little change after the charge-transfer complexes are formed, but the characteristic vibrational bands have some red shift or blue shift. The charge transfer takes place under sunlight. There is a new absorption band at 625 nm in the solid reflectance electronic spectra of the complexes, it is ascribed to the IVCT (W(V)→W(Ⅵ) band of the reduced anion ［CuP₂W₁₇O₆₂］^10-. The conductivities at room temperature of title complexes are 3.6×10^-9 S·cm^-1 and 5.4×10^-9 S·cm^-1, respectively. Both of them are weak semiconductors.

SYNTHESIS AND PROPERTIES OF CHARGE TRANSFER COMPLEXES OF COPPER SUBSTITUTED POLYOXOTUNGSTATE WITH DAWSON STRUCTURE