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Issue 34, 2009
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Voltammetry of [R4N]4[M18O54(SO3)2] and [Ru(bpy)3]2[M18O54(SO3)2] (M = Mo, W) as microcrystals adhered to a glassy carbon electrode surface in contact with ionic liquid media

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Abstract

Based on studies with microcrystals of [Ru(bpy)3]2[α-W18O54(SO3)2] adhered to an electrode surface in contact with the ionic liquids [BMIM][PF6] and [BMIM][BF4], it has been found that a series of well defined monoelectronic reduction processes associated with the tungsten-oxo cage of the [α-W18O54(SO3)2]4− species are observed at much less negative potentials than found in conventional organic solvents. Furthermore, since the potentials of the [Ru(bpy)3]2+ 2,2′-bipyridyl ligand based reduction processes are not strongly medium dependent, ionic liquid investigations allowed the characterisation of the [Ru(bpy)3]2[α-W18O54(SO3)2] complex without extensive overlap of the ligand based reductions from the [Ru(bpy)3]2+ cation and the [W18O54(SO3)2]4− anions. In the case of the Mo analogues, [α and β-Mo18O54(SO3)2]4−, the much higher reactivity of the reduced forms precluded access to well defined monoelectronic reversible steps at negative potentials in all media examined, even though reduction is far easier and hence availability of extensively reduced species should be simpler, in a thermodynamic sense.

Graphical abstract: Voltammetry of [R4N]4[M18O54(SO3)2] and [Ru(bpy)3]2[M18O54(SO3)2] (M = Mo, W) as microcrystals adhered to a glassy carbon electrode surface in contact with ionic liquid media

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Publication details

The article was received on 16 Dec 2008, accepted on 17 Apr 2009 and first published on 10 Jul 2009


Article type: Paper
DOI: 10.1039/B822167G
Citation: Dalton Trans., 2009, 6727-6735
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    Voltammetry of [R4N]4[M18O54(SO3)2] and [Ru(bpy)3]2[M18O54(SO3)2] (M = Mo, W) as microcrystals adhered to a glassy carbon electrode surface in contact with ionic liquid media

    M. Góral, T. McCormac, E. Dempsey, D. Long, L. Cronin and A. M. Bond, Dalton Trans., 2009, 6727
    DOI: 10.1039/B822167G

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