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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[HSiW_9Mo_2VO_(40)]和(TBA)_4[H_2SiW_9MoV_2O_(40)]。红外光谱与已知的β-(TBA)_4[SiW_9Mo_3O_(40)]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[H_2SiW_9MoV_2O_(40)]和β-(TBA)_4[H_3SiW_9V0_(40)]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。
In this paper, we have synthesized a class of tetrabutylammonium tungstosilicate (TBA) salt containing three kinds of tooth top atoms, which are: (TBA) _4 [HSiW_9Mo_2VO_ (40)] and (TBA) _4 [H_2SiW_9MoV_2O_ (40)]. The infrared spectrum is similar to that of β - (TBA) _4 [SiW_9Mo_3O_ (40)], so they have β-Keggin structure. In the solid state, TBA deforms due to the Coulomb interaction between the ions, weakening the C-N bond. It is known from the change of the stretching frequency of C-N bond that acid salts are β- [TBA] _4 [H_2SiW_9MoV_2O_ (40)] and β- (TBA) _4 [H_3SiW_9V0_ (40)]. The X-ray diffraction and differential thermal curve proved that the above two tridentate heteropolyacid salt exist geometric isomers.