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引言早期流行的偏钨酸的结构式H_(10)[H_2(W_2O_7)_6]·aq是Copaux 根据偏钨酸和12-杂多酸同晶运用MioIati理论的基本论点而给出的。但由于此式所标示的碱度与实际不符而W_2O_7的存在又始终未得到实验证实,所以它并未反映出偏钨酸的真实结构。Keggin用乐琴射线法所确定的12-杂多酸的结构给偏钨酸结构的了解带来了极好的线索,它使Signer和Gross有可能从几种杂多酸和偏钨酸的粉末图的比较中断定它们之间结构完全的相似性,从而得出后者的结构式应该是H_6[H_2(W_3O_(10))_4]·aq其中H_2像杂多酸中的非金属原子一样作为络合物的“中心原子”。它的存在使络离子
Introduction The structural formula of H_ (10) [H_2 (W_2O_7) _6] · aq of the early prevailing metatungstic acid is given by Copaux on the basis of the basic theory of the MioIati theory that metatungstic acid and 12-heteropoly acid are isomorphic. However, since the alkalinity indicated by this formula does not correspond to the actual value, the existence of W_2O_7 has not been confirmed experimentally, so it does not reflect the true structure of metatungstic acid. Keggin’s structure of the 12-heteropolyacid, as determined by the musician’s ray method, gives an excellent clue to the understanding of the structure of metatungstic acid, which makes it possible for Signer and Gross to synthesize several heteropolyacid and metatungstic acid powders The comparison of the graphs breaks the complete similarity of the structures between them, and the formula of the latter should be H_6 [H_2 (W_3O_ (10)) _4] · aq. H_2, like the nonmetal atoms in heteropoly acids, The “center atom” of the compound. Its existence makes complex ions