Unexpected metal-mediated oxidation of hydroxymethyl groups to coordinated carboxylate groups by bis-cyclometalated iridium(iii) centers
作者:Beatrice Beyer、Christoph Ulbricht、Andreas Winter、Martin D. Hager、Richard Hoogenboom、Nicole Herzer、Stefan O. Baumann、Guido Kickelbick、Helmar Görls、Ulrich S. Schubert
DOI:10.1039/b9nj00785g
日期:——
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 μ-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.
应用两种不同的“点击”反应程序来合成 1-芳基和 4-芳基官能化 1H-[1,2,3]三唑库,作为磷光铱 (III) 配合物的新配体。对三个例子进行了单晶X射线分析并讨论了结构特性。制备反应性μ-二羟基桥铱(III)前体络合物[(ppy)2Ir-μ-(OH)]2(ppy=2-苯基吡啶基)用于络合本文所述的配体。在这些络合研究中,观察到羟甲基取代的 1-芳基-1H-[1,2,3]三唑 2d-f 出现了意想不到的金属辅助氧化途径,选择性地导致[羧酸酯-N3,O]-配位铱(III)中心的配体。