Generation and characterisation of the phenoxyl-radical containing Cu(ii) complex [Cu(triaz)2]+ (triaz = O,N chelating triazole-phenolate)Electronic supplementary information (ESI) available: NMR, UV/Vis and ESI-MS spectra. Tables with selected crystal structure and refinement data of [Cu(triaz)2] and further diagrams on the crystal structure of [Cu(triaz)2], CVs of Htriaz and [Cu(triaz)2], as well as further absorption and EPR spectra. CCDC 862059. For ESI and crystallographic data in CIF or ot

The new copper complex [Cu(triaz) 2 ] (Htriaz = 2,4-di-( tert -butyl)-6-(5-chloro-2 H -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). The generation, spectroscopic properties, stability and catalytical potential of the novel phenoxyl copper complex [Cu(triaz) 2 ] + containing a benzotriazole-phenoxyl ligand were investigated.