Synthesis,183W NMR spectroscopic characterization and properties of trisubstituted heteropolytungstates containing Group 3A elements

被引：8

作者：

Meng, L ^{[1
]}

Zhan, XP ^{[1
]}

Wang, M ^{[1
]}

Liu, JF ^{[1
]}

机构：

[1] NE Normal Univ, Fac Chem, Changchun 130024, Peoples R China

来源：

POLYHEDRON | 2001年 / 20卷 / 9-10期

关键词：

Group 3A elements; trisubstituted tungstosilicate or tungstogermanate; W-183; NMR;

D O I：

10.1016/S0277-5387(01)00750-1

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The heteropolytungstates alpha,beta -KaHbXW9M3O37(H2O)(3).n H2O (X = Si,Ge; M = Al, Ga, In, a + b = 7) are reported. All their W-183 NMR spectra consist of two lines with an intensity ratio 2:1, as expected for the C-3r structure of trisubstituted A alpha, A beta -Keggin anions. They have characteristic patterns of W-183 NMR chemical shifts: delta (belt) (W) > delta (cap) (W), Delta = delta (belt) - delta (cap) > 0 and Delta (alpha) (isomer) > Delta (beta) isomer. In addition, the chemical shifts of tungstosilicates shift 15 +/- 5 ppm upfield with respect to tungstogermanates, probably resulting from the different ionic radii of silicon and germanium. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：881 / 885

页数：5

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