Jf. Liu et al., SYNTHESIS AND V-51 AND W-183 NMR-STUDY OF ALPHA-K6H[GEW9V3O40].XH2O AND BETA-K6H[GEW9V3O40].XH2O, Huaxue xuebao, 51(4), 1993, pp. 368-372
The trivanadium-substituted polyoxoanions A-alpha and A-beta-K6H[GeW9V
3O40] . xH2O have been synthesized from their lacunary precursors alph
a- and beta-GeW9O3410-, and characterized by elemental analysis, IR, c
yclic voltammogram and V-51 and W-183 NMR. W-183 NMR spectra of the ti
tle anions consist of two lines (intensity ratio 2:1) as expected for
the C3v structures of the trisubstituted Aalpha- and Abeta-Keggin anio
ns. The 2J(W-O-W) couplings of title anions exhibits sharper lines (19
.35 and 16.73 Hz respectively), confirming the A-type [GeW9V3O40]7- st
ructure, that is the new complexes contain the substituted vanadium in
adjacent corner-shared octahedra of alpha- and beta-Keggin structures
respectively.