Molybdovanadophosphoric acids and their salts. I. Investigation of methods of preparation and characterization
Molybdovanadophosphoric acids and their salts. I. Investigation of methods of preparation and characterization
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DOI：
10.1021/ic50061a009
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发表时间：
1968-03
影响因子：
4.6
通讯作者：
G. Tsigdinos;C. Hallada
中科院分区：
文献类型：
--
作者：
G. Tsigdinos;C. Hallada
采用改进的工艺，制备了游离杂多酸H4 [pmoiov2040]-34H20、H5 [pmoiov2040]- 32h20和H6-[PM09V3O40]·34H20。电位滴定测定表明，这些游离酸中可替换氢离子的数量分别为4、5和6个。首次制备了Na4 [pmonv040]-8H20盐和（NH4） 3H [pmonv040]-7.5 HaO盐。磷酸钒钼阴离子具有异常高的水解稳定性。得到了这些盐的红外、可见光和紫外光谱。对H4 [pmonv040]·32 20和Na4 [pmouv040]·8H20进行了热重分析和差热分析。以甲醇为溶剂，NaOCHs为滴定剂的电位滴定测定表明，H4 [pmonv040]酸在低介电常数溶剂中呈四质子态。
By the use of improved procedures, the free heteropoly acids H4 [PMouV04o]-34H20, H5 [PMoioV204o]-32H20, and H6-[PM09V3O40]· 34H20 were prepared reproducibly as orange crystalline solids. Potentiometric titration measurements showed that the number of replaceable hydrogen ions in these free acids is four, five, andsix, respectively. The salts Na4 [PMon-V04o]-8H20 and (NH4) 3H [PMonV04o]-7.5 HaO were prepared for the first time. The molybdovanadophosphate anion had unusually high hydrolytic stability. Infrared, visible, and ultraviolet spectra were obtained for these salts. Thermogravimetric and differential thermal analyses were performed on H4 [PMonV04o]· 32 20 and Na4 [PMouV04o]· 8H20. Potentiometric titration measurements with methanol as the solvent and NaOCHs as the titrant showed that the H4 [PMonV04o] acid is tetraprotic in solvents with lowdielectric constants.