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X_2M_(17)O_(61)~(10-)(其中X=P(V)、As(V);M=Mo(Ⅵ)、W(Ⅵ))由Dawson结构(X_2M_(18)O_(62)~(6-))衍生而来的缺位杂多阴离子,即从X_2M_(18)O_(62)~(6-)的“极”或“赤道”位失去一个M-O_4单位后,形成一个空穴,象这样具有空穴的杂多阴离子被称为缺位或不饱和杂多阴离子。它在多酸型配合物的合成中具有重要用途,可做为四齿或五齿配体与金属离子配位,分别形成RE(X_2M_(17)O_(61))_2~(17-)
X 2 M 17 O 61- 10 - (where X = P (V), As (V); M = Mo (VI) and W (VI) ) ~ (6-)) derived from the absence of one M-O_4 unit from the “pole” or “equator” of X_2M_ (18) O_ (62) ~ A hole, such as a heteropolyanion having holes, is referred to as a vacancy or an unsaturated heteropolyanion. It has an important application in the synthesis of polyacid complexes and can be used as a four-tooth or pentagonal ligand to coordinate with metal ions to form RE (X 2 M 17 O 61) 2 2- (17-)