Unexpected metal-mediated oxidation of hydroxymethyl groups to coordinated carboxylate groups by bis-cyclometalated iridium(III) centers

作者：Beyer Beatrice; Ulbricht Christoph; Winter Andreas; Hager Martin D; Hoogenboom Richard; Herzer Nicole; Baumann Stefan O; Kickelbick Guido; Goerls Helmar; Schubert Ulrich S^*

来源：New Journal of Chemistry, 2010, 34(11): 2622-2633.

DOI：10.1039/b9nj00785g

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 mu-dihydroxy-bridged iridium(III) precursor complex [(ppy)(2)Ir-mu-(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-N(3),O]-coordination of the ligands to the iridium(III) centers.

• 出版日期2010