名称:
                                Synthesis, structures, and properties of iridium(III) bis-cyclometallated complexes containing three-atom chelates
                             
                            
                                摘要:
                                Heating of [Ir(eta(2)-ppy)(2)(MeCN)(2)]NO3 (1, ppy = 2-phenylpyridine)in MeCN under reflux afforded [Ir(eta(2)-ppy)(2)(eta(2)-NO3)] (2). Treatment of 1 with 2-mercaptopyridine (Hmp), 6-methyl-2-hydroxypyridine (Hmhp), 6-chloro-2-hydroxypyridine (Hchp), trimethylacetic acid (Htma), benzoic acid (Hbz), 2-methylacrylic acid (Hma), and acetic acid (Hac)in the presence of excess Et3N produced [Ir(eta(2)-ppy) (2)(eta(2)-XZY)] (XZY(-) = mp(-) (3), mhp(-) (4), chp(-) (5), ac(-) (6), bz(-) (7), ma(-) (8), tma(-) (9)). Crystal structures of 2, 3, 7, 8, and 9 have been characterized by X-ray diffraction. The inherent strain contained in the four-member rings, {Ir(eta(2)-XZY)}, is apparently reflected in the long Ir-X and Ir-Y distances. The absorption and emission properties of nearly all the new complexes except 2 show small variations. (C) 2007 Elsevier B.V. All rights reserved.