【摘要】 本文合成了一类未见报道的含三种齿顶原子的钨钼钒硅酸四丁基铵（TBA）盐,它们是:（TBA）₄[HSiW₉Mo₂VO₄₀]和（TBA）₄[H₂SiW₉MoV₂O₄₀]。红外光谱与已知的β-（TBA）₄[SiW₉Mo₃O₄₀]相似,故它们具有β-Keggin结构。在固态时,由于离子间的库仑作用,使TBA变形,从而削弱了C—N键。由C—N键的伸缩频率变化可知β-[TBA)₄[H₂SiW₉MoV₂O₄₀]和β-（TBA）₄[H₃SiW₉V0₄₀]为酸式盐。由X光衍射和差热曲线证明上述两种三齿顶杂多酸盐存在着几何异构体。更多还原

【Abstract】 A new type of polymetalatosilicate which contains three different metals-tungsten,molybdenum and vanadium-has been prepared. The compound β-Na9 [HSiW9O34 ]·23H2O which has vacant addend sites was first prepared by the reaction of Na2WO4·2H2O and Na2SiO3·9H2O. Then appropriate amounts of molybdate and vanadate were added to form products of precise Keggin structure. Two new tungstomolybdovanado-silicate compounds were obtained,and elemental analysis gave their composition as: (TBA)4[HSiW9Mo2VO40] and (TBA)4 [H2SiW9MoV2O40] (TBA stands for tetrabutylammonium). The IR spectra of both compounds are similar to that of the well-known β-(TBA)4[SiW9Mo3O40], so they are theβ-isomer of Keggin structure. In solid state due to the action of the complex anion, the cation TBA of the compound is somewhat deformed and as a result the C-N bond is weakened. The change of frequency of the C-N bond indicated that β-(TBA)4[H2SiW9MoV2O40] and β-(TBA)4[H3SiW9V3O40] are acidic salts. The results of X-ray diffraction and TG studies revealed that the heteropolymetalatosilicate has geometric isomer.更多还原