Generation and characterisation of the phenoxyl-radical containing Cu(II) complex [Cu(triaz)2]+ (triaz- = O,N chelating triazole-phenolate).

Katharina Butsch, Axel Klein, Sara Nitsche, Kathrin Stirnat, Jonathon R Hawkett, Eric J L McInnes, Matthias Bauer

Universität zu Köln, Department für Chemie, Institut für Anorganische Chemie, Greinstrasse 6, D-50939 Köln, Germany.

Dalton transactions (Cambridge, England : 2003) 2012 Oct 7

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The new copper complex [Cu(triaz)(2)] (Htriaz = 2,4-di-(tert-butyl)-6-(5-chloro-2H-benzo[d][1,2,3]triazol-2-yl)phenol) was investigated in detail by single crystal XRD, EPR-, UV/Vis-absorption-, CV-, and spectroelectrochemistry. The oxidised species [Cu(triaz)(2)](+) was characterised by UV/Vis spectroelectrochemistry and contains a phenoxyl-radical bound to Cu(II). This quite stable species was chemically generated by two different methods: aerial oxidation of a Cu(I) precursor in the presence of Htriaz (and base) or from [Cu(triaz)(2)] by adding a Cu(II) salt (disproportionation). The efficiency for the latter reaction has been studied by UV/Vis spectroscopy, XAS and catalytic test reactions (oxidation of benzyl alcohol).

Citation

Katharina Butsch, Axel Klein, Sara Nitsche, Kathrin Stirnat, Jonathon R Hawkett, Eric J L McInnes, Matthias Bauer. Generation and characterisation of the phenoxyl-radical containing Cu(II) complex [Cu(triaz)2]+ (triaz- = O,N chelating triazole-phenolate). Dalton transactions (Cambridge, England : 2003). 2012 Oct 7;41(37):11464-75