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

Abstract

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).

Air‐stable copper derivatives as efficient catalysts for controlled lactide polymerization: Facile synthesis and characterization of well‐defined benzotriazole phenoxide copper complexes

“…The bond angles around Cu center in 1 are classified into two sets: one in a range 89.43(13)‐92.85(12)° and the other in a range 158.07(14)‐167.95(12)°, which indicate a distorted square planar geometry. The average bond lengths between the Cu atom and O(phenoxy) and N(benzotriazole) are, respectively, 1.876(3) and 1.968(3) Å for 1, which are all comparable with those observed for the monomeric copper complexes bearing the O,N ‐chelating triazole‐phenolate derivative . In comparison, the Cu‐containing bond distances and angles for 2 are similar to those found for complex 1 as shown in Supporting Information Table S2.…”

Polymers Based on Stable Phenoxyl Radicals for the Use in Organic Radical Batteries

“…Phenoxyl radicals have been studied as products of the metabolism of β 2 ‐agonists salbutamol and fenoterol, for their hydrogen‐bonding capabilities, and in metal complexes . Additionally, these radicals were employed in poly(3‐radical‐substituted thiophene)s and poly(phenylene vinylene)s to study their magnetic and electrical properties .…”

Nucleophile‐Selective Cross‐Coupling Reactions with Vinyl and Alkynyl Bromides on a Dinucleophilic Aromatic Substrate

“…The oxidation of II at an applied potential of 0.6 V leads to a new absorption band at 410 nm, which is typically observed for π–π* transitions of phenoxide radicals (Figure S11) 23. Additional bands with a lower energy were not observed 23c…”