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Issue 31, 2009
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A route to a Keggin-Type α-[(XIIIO4)Mo12O35(OH)]4− anion through an Anderson-type [XIII(OH)6Mo6O18]3− anion: X = Ga

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Abstract

From an aqueous MoVI–GaIII–HCl system, a colourless complex was isolated as a K+ salt, which consists of a hexaprotonated Anderson-type [Ga(OH)6Mo6O18]3− anion. A yellow complex became kinetically stable by the presence of CH3CN at concentrations of 30–40% (v/v). The X-ray structural analysis revealed that the yellow (NPrn4)4[(GaO4)Mo12O35(OH)] crystal contains an α-Keggin structure and the oxygen atom at an edge-shared contact is protonated. The formation conditions of the Keggin complex were elucidated in relation to those of the Anderson complex by a combined 71Ga NMR and voltammetric study. Evidence was obtained of a spontaneous conversion of [Ga(OH)6Mo6O18]3− to [(GaO4)Mo12O35(OH)]4− in the MoVI–GaIII system.

Graphical abstract: A route to a Keggin-Type α-[(XIIIO4)Mo12O35(OH)]4− anion through an Anderson-type [XIII(OH)6Mo6O18]3− anion: X = Ga

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Publication details

The article was received on 10 Feb 2009, accepted on 24 Apr 2009 and first published on 08 Jun 2009


Article type: Paper
DOI: 10.1039/B902794G
Citation: Dalton Trans., 2009,0, 6114-6119
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    A route to a Keggin-Type α-[(XIIIO4)Mo12O35(OH)]4− anion through an Anderson-type [XIII(OH)6Mo6O18]3− anion: X = Ga

    S. Himeno, S. Murata and K. Eda, Dalton Trans., 2009, 0, 6114
    DOI: 10.1039/B902794G

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