Raman Studies on the Identification of Isopolymolybdates in Aqueous Solution

Molybdenum(VI) solutions were investigated in detail by Raman spectroscopy with a view to establishing the speciation of the predominant polynuclear species (isopolymolybdates) formed in aqueous solution. The most intense Raman frequencies due to asymmetric stretching vibration of Mo=O were very sen...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 1997-03, Vol.70 (3), p.631-637
Main Authors: Himeno, Sadayuki, Niiya, Hirotaka, Ueda, Tadaharu
Format: Article
Language:English
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Summary:Molybdenum(VI) solutions were investigated in detail by Raman spectroscopy with a view to establishing the speciation of the predominant polynuclear species (isopolymolybdates) formed in aqueous solution. The most intense Raman frequencies due to asymmetric stretching vibration of Mo=O were very sensitive to even small changes of the structure of the isopolymolybdates. As the pH was lowered, the major Raman line showed no gradual shift but exhibited a discrete change. Evidence was obtained for the existence of Mo7O246− (pH 4—6), Mo3O102− (pH 3.5—5), α-Mo8O264− (pH 2—5), β-Mo8O264− (pH 1.5—4), and Mo36O1128− (pH 0.5—1.5). On the other hand, neither of Mo6O192− and γ-Mo8O264− existed in any appreciable amount in aqueous solution.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.70.631