Journal article

Applications of Molybdenum-95 N.M.R. Spectroscopy. X Polyoxomolybdates

SFG Heller, M Sidney, AF Masters, RTC Brownlee, MJ O’Connor, AG Wedd

Australian Journal of Chemistry | Published : 1984

Abstract

An initial survey of the 95Mo n.m.r. properties of a range of 12 polyoxomolybdates is presented. The species resonate in the range -18 to + 140 ppm. The observed linewidths generally exceed 100 Hz for six-coordinate molybdenum sites of low symmetry, but can be narrow (<20 Hz at 20°) for four-coordinate sites. Aqueous solutions of [Mo7O24]6- at pH 6•1 exhibit exchange between Mo- and Mo7-based species. Solutions of a-[Mo8O26]4- in MeCN feature a single narrow resonance (d 16, Wh/2 23 Hz at 20°) assigned to the tetrahedral capping sites, while two broad resonances (d 19, Wh/2 240 Hz; d 109, Wh/2 c. 270 Hz) are seen in equivalent solutions of ß-[Mo8O26]4-. In the cases cited above, 17O n.m.r. i..

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