SYNTHESES AND MULTINUCLEAR NMR CHARACTERIZATIONS OF ALPHA-[SIMO2W9O39]8- AND ALPHA-[SIMO3-XVXW9O40](4+X)-(X=1,2) HETEROPOLYOXOMETALATES

被引：48

作者：

CADOT, E ^{[1
]}

THOUVENOT, R ^{[1
]}

TEZE, A ^{[1
]}

HERVE, G ^{[1
]}

机构：

[1] UNIV PARIS 06,CHIM MET TRANSIT LAB,CNRS,UNITE ASSOCIEE 419,CASE 42,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE

来源：

INORGANIC CHEMISTRY | 1992年 / 31卷 / 20期

关键词：

D O I：

10.1021/ic00046a026

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The alpha-[SiMo3-xVxW9O40](4+x)- (x = 1, 2) mixed heteropolyanions were obtained from A-alpha-[SiW9O34]10- by stereospecific synthetic routes via the monovacant alpha-[SiMo2W9O39]8- anion. Structural analyses by W-183 NMR have proved that the structure of the A-alpha-[SiW9O34]10- subunit is retained in all these compounds. 2D COSY W-183 NMR has been applied to alpha-[SiMo2VW9O40]5-in order to establish unambiguously the complete assignment. The magnitudes of the 2J(W-O-W) values are discussed with respect to the occupancy of sites 1-3 (vacancy, molybdenum-(VI), or vanadium(V)), providing information about the deformations induced in the tungstic subunit. Also discussed are the V-51 line shape with respect to the respective peculiarities of the V-O-V, V-O-Mo, and V-O-W mu-oxo bridges and a correlation between the line broadenings of V-51 and W-183.

引用

页码：4128 / 4133

页数：6

共 25 条

[1] DAWSON TYPE HETEROPOLYANIONS .1. MULTINUCLEAR (P-31, V-51, W-183) NMR STRUCTURAL INVESTIGATIONS OF OCTADECA(MOLYBDOTUNGSTOVANADO)DIPHOSPHATES ALPHA-1,2,3-[P2MM'2W15O62]N- (M, M' = MO, V, W) - SYNTHESES OF NEW RELATED-COMPOUNDS [J].