B. Beyer, C. Ulbricht, A. Winter, M. Hager, R. Hoogenboom, N. Herzer, S. Baumann, G. Kickelbick, H. Görls, U. Schubert:
"Unexpected metal-mediated oxidation of hydroxymethyl groups to coordinated carboxylate groups by bis-cyclometalated iridium(III) centers";
New Journal of Chemistry, 34 (2010), 11; S. 2622 - 2633.

Kurzfassung englisch:
Two different procedures of the `click“ reaction were applied to synthesize a library of 1-aryl- and 4-aryl-functionalized 1H-[1,2,3]triazoles as new ligands for phosphorescent iridium(III) complexes. For three examples, single crystal X-ray analysis was carried out and the structural properties were discussed. The reactive m-dihydroxy-bridged iridium(III) precursor complex [(ppy)2Ir-µ-(OH)]2 (ppy = 2-phenylpyridinato) was prepared for the complexation of the herein described ligands. During these complexation studies, an unexpected metal-assisted oxidation pathway was observed for the hydroxymethyl-substituted 1-aryl-1H-[1,2,3]triazoles 2d-f leading selectively to a [carboxylate-N3,O]-coordination of the ligands to the iridium(III) centers.

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