二空缺Dawson型钨磷酸盐K_(10)Na_2H_2P_2W_(16)O_(60)·18H_2O的合成、结构和溶液的稳定性  

Synthesis, Structure of Di-vacant Dawson Phosphotungstate K_(10)Na_2H_2P_2W_(16)O_(60)·18H_2O and Its Stability in Solution

作　　者：吴新国[1] 蒋安仁[1] 

机构地区：[1]复旦大学化学系,上海200433

出　　处：《高等学校化学学报》1992年第4期429-432,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金

摘　　要：用刚酸化的Na_2WO_4溶液(H^+/WO_4^(2-)=1.14,摩尔比)与Na_2HPO_4混合,酸化至pH6.5～6.9,再加入KCl固体,可制得K_(10)Na_2H_2P_2W_(16)O_(60)·18H_2O晶体。经元素分析、VO^(2+)光度滴定、^(31)PNMR、^(183)W NMR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H_7PW_8O_(33)^(6-);将K^+换成Na^+时,主要分解产物为PW_(11)O_(39)^(7-)。The slightly soluble crystals K10Na2H2P2W16O60· 18H2O can be obtained by additionally adding excess KCl to a slightly acidic solution (pH 6. 5 - 6.9) which can be prepared by acidizing the mixture of para A and Na2HPO4 with HCl to the right pH value. Para A is 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+.

关 键 词：二空缺 DAWSON结构 钨磷酸盐 NMR 

分 类 号：O614.613[理学—无机化学]