钼钒砷杂多酸有机铵盐的合成及热稳定性研究

Synthesis and Thermal Investigation of Amine Salts of Molydovanadoarsenic Acid

合成了 4个系列 (14种 )钼钒砷有机铵盐 .用红外光谱、 p H电位滴定、 DTA - TG对其进行表征 ,确认其分子式为 [Rn NH4- n]4[HPA](R=Me、 Et、 Pr、 Bu基 ;n=1、 2、 3、 4) ;并采用 DTA - TG、 IR进行系列盐分步切断的热性质研究 .发现其稳定性随烷基增大、取代基数目增多而增加 ;且盐的分解是分步进行的 。

Four series, fourteen amine salts of molydovanadoarsenic acid have been synthesized and characterized using IR, DTA\|TG and pH potential titration. The molecular formula of these compounds were proposed to be [R\- n NH 4- n ] 4 (R=Me? Et? Pr? Bu; n =1, 2, 3, 4). By the combination of DTA\|TG and IR, i.e. after the appearance of every DTA\|TG peak the sample was subjected to IR detection immediately after cooling. Their thermal character is investigated. The conclusion is that with the increase of the size and the number of alkyl groups, the stability of these compounds increases. The thermal decomposition occurs gradually and the final products are composite oxides of V\-2O\-5, As\-2O\-5 and MoO\-3.