Synthesis, structure, photophysical and electrochemical properties of series of new fac-triscyclometallated iridium complexes with carbazole or oxadiazole moieties
作者:Qiu-Lei Xu、Hong-Yan Li、Cheng-Cheng Wang、Song Zhang、Tian-Yi Li、Yi-Ming Jing、You-Xuan Zheng、Wei Huang、Jing-Lin Zuo、Xiao-Zeng You
DOI:10.1016/j.ica.2012.05.010
日期:2012.8
A series of new fac-triscyclometallated iridium complexes Ir(Ln)(3) (n = 1-6) (L-1: 2-4-[5-phenyl-[1,3,4] oxadiazol-2-yl]-phenyl}-pyridine, L2: 2-4-[5-(4-tert-butyl-phenyl)-[1,3,4] oxadiazol-2-yl]-phenyl}pyridine, L3: 9-(4-pyridin-2-yl-phenyl)-9H-carbazole, L4: 1-[4-(5-phenyl-[1,3,4] oxadiazol-2-yl)-phenyl]- isoquinoline, L5: 1-4-[5-(4-tert-butyl-phenyl)-[1,3,4] oxadiazol-2-yl]-phenyl}-isoquinoline, L6: 9-(4-isoquinolin-1-yl-phenyl)-9H-carbazole) based on Ir(ppy)(3) (ppy = phenyl-pyridine) and Ir(piq)(3) (piq = 1-phenylisoquinoline) were synthesized from Ir(acac)(3) and corresponding ligands by a new and effective way using anthracene as a solvent. Single-crystal X-ray diffraction spectra of three complexes were studied and the iridium centers were found to adopt distorted octahedral coordination geometry. UV-Vis, photoluminescence, cyclic voltammetry were employed for studying the photophysical and electrochemical properties. These complexes exhibit intense phosphorescence in toluene solution at room temperature with high quantum efficiencies (0.07-0.58) and submicrosecond lifetimes (0.57-0.87 mu s). (C) 2012 Elsevier B.V. All rights reserved.