51V and 17O NMR Studies of the Mixed Metal Polyanions in Aqueous V-Mo Solutions Full article
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Polyhedron
ISSN: 0277-5387 |
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Output data | Year: 1987, Volume: 6, Number: 10, Pages: 1813-1821 Pages count : 9 DOI: 10.1016/S0277-5387(00)81089-X | ||
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Abstract:
NaVO3Na2MoO4 solutions acidified with HCl were studied at the atomic V/Mo ratios equal to 3 : 1, 1 : 1, 1 : 3, 1 : 6 and vanadium concentration [V] = 0.1, 0.04, 0.004 and 0.0004 M in the range pH 7-2. Their 51V NMR spectra (measured at Hito = 7 T) were compared with those of VW solutions containing mixed metal complexes of known composition. The VMo5O19 3- (51V NMR chemical shift relative to VOCl3, δ, -502 ppm), V2Mo4O19 4- (δ -494), V2Mo4O19 3- δ -507), V9MoO28 5- (δ -422, -492, -501, -512, -521.5) and HV9MoO28 4- polyanions (p.a.) have been found to be dominant mixed species in Na-V-Mo solutions. Along with them the VitxMO13-itxO-itx-3 40 p.a.(x∼2-3) of the Keggin type (δ -496, -498, -516, -522) are supposed to be formed at pH < 4 in concentrated solutions ([V] > 0.01 M). The V2Mo6O26 6- p.a., isolated at pH ∼ 5 as the sodium salt (solid state δ -482), seem to be present in concentrated Na-V-Mo solutions only as minor species. On dissolving the salt the V2Mo6O26 6- p.a. mainly disproportionates into the complexes mentioned. From solutions containing mainly the V9MoO28 5- p.a. the sodium salt of V10O28 6- is crystallized. The V9WO28 6- p.a. are detected in VW solutions at V/W > 1. 17O and 95Mo NMR spectra of some mixed complexes are described. The distribution diagrams for VMo and V-W solutions at
[V] = 0.004 M and V/Mo(W) = 1:3, derived from their 51V NMR spectra, are given.
Cite:
Maksimovskaya R.I.
, Chumachenko N.N.
51V and 17O NMR Studies of the Mixed Metal Polyanions in Aqueous V-Mo Solutions
Polyhedron. 1987. V.6. N10. P.1813-1821. DOI: 10.1016/S0277-5387(00)81089-X WOS Scopus РИНЦ РИНЦ
51V and 17O NMR Studies of the Mixed Metal Polyanions in Aqueous V-Mo Solutions
Polyhedron. 1987. V.6. N10. P.1813-1821. DOI: 10.1016/S0277-5387(00)81089-X WOS Scopus РИНЦ РИНЦ
Dates:
Submitted: | Dec 1, 1986 |
Published print: | Jan 1, 1987 |
Accepted: | Mar 25, 1987 |
Published online: | Apr 30, 2001 |
Identifiers:
Web of science | WOS:A1987K133200002 |
Scopus | 2-s2.0-0001138941 |
Elibrary | 30816194 , 22450113 |
Chemical Abstracts | 1988:86854 |
Chemical Abstracts (print) | 108:86854 |
OpenAlex | W2054780529 |