Vanadium(V)/Vanadium(iii) Redox Couple in Acidic Organic Media. Structure of a Vanadium(III)-Tetraethylene Glycol Pentagonal-Bipyramidal Complex ([V(teg)(Br)2]+Br-)

Ronny Neumann; Igal Assael

doi:10.1021/ja00204a013

Vanadium(V)/Vanadium(iii) Redox Couple in Acidic Organic Media. Structure of a Vanadium(III)-Tetraethylene Glycol Pentagonal-Bipyramidal Complex ([V(teg)(Br)₂]⁺Br^-)

Ronny Neumann^*, Igal Assael

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The vanadium(V)/vanadium(III) redox couple was investigated in an acidic organic medium by reduction of sodium metavanadate by hydrogen bromide with 1,2-dichloroethane as solvent in the presence of tetraglyme as a complexing agent. In the absence of dioxygen a vanadium(III)-tetraethylene glycol (teg) pentagonal-bipyramidal complex, [V(teg)(Br)₂]⁺Br^-, is formed. In the presence of dioxygen a catalytical cycle is initiated whereby vanadium(V) oxidizes hydrogen bromide to molecular bromine. The reduced vanadium(III) species thereby formed is reoxidized by dioxygen to vanadium(V) as confirmed by ESR and UV-vis of the organic phase.

Original language	English
Pages (from-to)	8410-8413
Number of pages	4
Journal	Journal of the American Chemical Society
Volume	111
Issue number	22
DOIs	https://doi.org/10.1021/ja00204a013
State	Published - Oct 1989

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title = "Vanadium(V)/Vanadium(iii) Redox Couple in Acidic Organic Media. Structure of a Vanadium(III)-Tetraethylene Glycol Pentagonal-Bipyramidal Complex ([V(teg)(Br)2]+Br-)",

abstract = "The vanadium(V)/vanadium(III) redox couple was investigated in an acidic organic medium by reduction of sodium metavanadate by hydrogen bromide with 1,2-dichloroethane as solvent in the presence of tetraglyme as a complexing agent. In the absence of dioxygen a vanadium(III)-tetraethylene glycol (teg) pentagonal-bipyramidal complex, [V(teg)(Br)2]+Br-, is formed. In the presence of dioxygen a catalytical cycle is initiated whereby vanadium(V) oxidizes hydrogen bromide to molecular bromine. The reduced vanadium(III) species thereby formed is reoxidized by dioxygen to vanadium(V) as confirmed by ESR and UV-vis of the organic phase.",

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year = "1989",

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N2 - The vanadium(V)/vanadium(III) redox couple was investigated in an acidic organic medium by reduction of sodium metavanadate by hydrogen bromide with 1,2-dichloroethane as solvent in the presence of tetraglyme as a complexing agent. In the absence of dioxygen a vanadium(III)-tetraethylene glycol (teg) pentagonal-bipyramidal complex, [V(teg)(Br)2]+Br-, is formed. In the presence of dioxygen a catalytical cycle is initiated whereby vanadium(V) oxidizes hydrogen bromide to molecular bromine. The reduced vanadium(III) species thereby formed is reoxidized by dioxygen to vanadium(V) as confirmed by ESR and UV-vis of the organic phase.

AB - The vanadium(V)/vanadium(III) redox couple was investigated in an acidic organic medium by reduction of sodium metavanadate by hydrogen bromide with 1,2-dichloroethane as solvent in the presence of tetraglyme as a complexing agent. In the absence of dioxygen a vanadium(III)-tetraethylene glycol (teg) pentagonal-bipyramidal complex, [V(teg)(Br)2]+Br-, is formed. In the presence of dioxygen a catalytical cycle is initiated whereby vanadium(V) oxidizes hydrogen bromide to molecular bromine. The reduced vanadium(III) species thereby formed is reoxidized by dioxygen to vanadium(V) as confirmed by ESR and UV-vis of the organic phase.

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Vanadium(V)/Vanadium(iii) Redox Couple in Acidic Organic Media. Structure of a Vanadium(III)-Tetraethylene Glycol Pentagonal-Bipyramidal Complex ([V(teg)(Br)₂]⁺Br^-)

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