高等学校化学学报 ›› 1992, Vol. 13 ›› Issue (4): 429.

• 论文 • 上一篇    下一篇

二空缺Dawson型钨磷酸盐K10Na2H2P2W16O60·18H2O的合成、结构和溶液的稳定性

吴新国, 蒋安仁   

  1. 复旦大学化学系, 上海, 200433
  • 收稿日期:1991-04-06 出版日期:1992-04-24 发布日期:1992-04-24
  • 通讯作者: 蒋安仁
  • 基金资助:

    国家自然科学基金

Synthesis, Structure of Di-vacant Dawson Phosphotungstate K10Na2H2P2W16O60·18H2O and Its Stability in Solution

WU Xin-guo, JIANG An-ren   

  1. Department of Chemistry, Fudan University, Shanghai, 200433
  • Received:1991-04-06 Online:1992-04-24 Published:1992-04-24

摘要: 用刚酸化的Na2WO4溶液(H+/WO42-=1.14,摩尔比)与Na2HPO4混合,酸化至pH6.5~6.9,再加入KCl固体,可制得K10Na2H2P2W16O60·18H2O晶体。经元素分析、VO2+光度滴定、31PNMR、183WNMR和紫外光谱等研究,确定为二空缺Dawson型结构;其溶液经60℃加热后,立即分解成H7PW8O336-;将K+换成Na+时,主要分解产物为PW11O397-

关键词: 二空缺Dawson结构, 钨磷酸盐, 183W核磁共振

Abstract: The slightly soluble crystals K10Na2H2P2W16O60· 18H2O can be obtained by additionally adding excess KCl to a slightly acidic solution (pH6.5~6.9) which can be prepared by acidizing the mixture of para Aand Na2HPO4 with HCl to the right pHvalue.Para Ais freshly prepared by acidizng the solution of Na2WO4 with HCl to the [H+]/[WO42-] value of 1.14.The compound was characterized by elemental analysis, VO2+ titration, UV, 31PNMR and 183W NMR spectroscopy.The structure of the compound belongs to Dawson type of species.This compound decomposes as a heteropoly anion H7PW8O336- when it dissolves in water by heating and also decomposes as a main product PW11O397- when the counterion in solution is changed from K+ to Na+.

Key words: Divacant Dawson structure, Phosphotungstate, 183W NMR

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