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Aqueous isopolymolybdates(VI): an oxygen-17 and molybdenum-95 nuclear magnetic resonance study

1990; Royal Society of Chemistry; Issue: 1 Linguagem: Inglês

10.1039/dt9900000081

2050-5671

Oliver W. Howarth, Paul F. Kelly, Lage Pettersson,

Metalloenzymes and iron-sulfur proteins

Aqueous molybdenum(VI) has been studied between pH 6 and 1.2 by 17O and 95Mo n.m.r. spectroscopy. Heptamolybdate, [Mo7O24]6–, its monoprotonated form, and β-octamolybdate, [Mo8O26]4, are clearly identified, and evidence has also been found for an intermediate species [H3Mo8O28]5–. The protonation site of heptamolybdate has been identified, and kinetic and structural data have been correlated to yield a scheme for the transformation of heptamolybdate to octamolybdate upon acidification.