Howarth, Oliver W., Pettersson, Lage and Andersson, Ingegärd. (1991) Aqueous molybdovanadates at high Mo: V ratio. Journal of the Chemical Society. Dalton Transactions, 1991 (No.7). pp. 1799-1812. ISSN 0300-9246

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Abstract

Aqueous molybdovanadates have been studied by V-51 NMR spectroscopy over a wide range of metalion concentrations and temperatures in the range pH 1.4-7, and by potentiometry at 25-degrees-C. The structures of the anions cis-[Mo4V2O19]4-, cis-[HMo4V2O19]3-, [Mo5VO19]3-, [Mo4V5O27]5-, [HMo4V5O27]4- and beta-[Mo7VO26]5- have been further confirmed or determined by parallel O-17 NMR studies. Some Mo-95 NMR data are also presented. Less conclusive evidence is also presented for the solution species alpha-[HMo6V2O26]5-, [Mo4VO17]5- and [HMo8V2O32]5- with a planar structure, and several alpha-Keggin species with central vanadium atoms. There is also tentative evidence for alpha-[HMo7VO26]4-, beta-[H2Mo6V2O26]4- and for species of 'double-heptamolybdate' type. Most of the structures are closely related to the known isopolymolybdates or to decavanadate. The vanadium atoms usually prefer central sites and mutual proximity. Calculations on combined precise electromotive force data and quantitative V-51 NMR data [25-degrees-C, 0.6 mol dm-3 Na(Cl) medium] using the least-squares computer program LAKE have established the formation constants. The chemical speciation is illustrated in distribution diagrams.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Divisions:	Faculty of Science > Chemistry
Journal or Publication Title:	Journal of the Chemical Society. Dalton Transactions
Publisher:	Royal Society of Chemistry
ISSN:	0300-9246
Date:	July 1991
Volume:	1991
Number:	No.7
Number of Pages:	14
Page Range:	pp. 1799-1812
Identification Number:	10.1039/DT9910001799
Status:	Not Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/22597

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