三取代杂多钨硅酸盐SiW_9M_3O_(40)~(n-)有4种异构体,即A-α、A-β、B-α、B-β型。α和β异构体的定向合成条件成熟且性质研究也较深入,故容易鉴别。A和B异构体则不易区分。我们合成了α和β-M_aH_b[SiW_9Fe_3(H_2O)_3O_(37)]·xH_2O(M=K~+,Me_4N~+,Et_4N~++Na~+,Bu_4N~+;a+b=7),测定了四乙基铵钠盐的Mssbauer谱、X射线光电子能谱和磁矩,确定了异构体中Fe的位置以及杂多阴离子的异构类型。 There are four isomers of trisubstituted heteropolytungstosilicate SiW_9M_3O_ (40) ~ (n-), namely A-α, A-β, B-α and B-β. The orientation synthesis of α and β isomers is mature and the nature of the study is also more in-depth, it is easy to identify. A and B isomers are not easy to distinguish. We synthesized α andβ-M_aH_b [SiW_9Fe_3 (H_2O) _3O_ (37)] · xH_2O (M = K ~ +, Me_4N ~ +, Et_4N ~ + + Na ~ +, Bu_4N ~ +; a + b = 7) The Mssbauer spectra, X-ray photoelectron spectra and magnetic moments of the tetraethylammonium sodium salt were determined. The position of Fe in the isomer and the heterogeneous type of heteropolyanion were determined.