TY - JOUR
T1 - New 2-phenyl-5-nitropyridyl containing iridium(III) cyclometalated complexes
T2 - Syntheses, structures, electrochemistry and photophysical properties
AU - Shen, Xuan
AU - Wang, Feng Ling
AU - Sun, Feng
AU - Zhao, Rui
AU - Wang, Xin
AU - Jing, Su
AU - Xu, Yan
AU - Zhu, Dun Ru
PY - 2011/9
Y1 - 2011/9
N2 - A series of new 2-phenyl-5-nitropyridyl containing iridium(III) cyclometalated complexes ([Ir(5-NO2-ppy)2Cl]2 (1, 5-NO2-ppy = 2-phenyl-5-nitropyridyl), Ir(5-NO2-ppy) 2(PPh3)Cl (2, PPh3 = triphenylphosphine), Ir(5-NO2-ppy)2(pic) (3, pic = picolinic acid)) have been synthesized and unambiguously characterized. The crystal structures of 2 and 3 have been determined by X-ray diffraction analyses. The HOMO-LUMO energy gaps of 1-3 estimated by the cyclic voltammetry (CV) show values in the order of 2 > 3 > 1. The UV-vis absorption and the solid photoluminescence (PL) spectra of 1-3 have also been measured, exhibiting the changing orders being consistent with that of the HOMO-LUMO energy gaps. Moreover, the UV-vis absorption spectra of 1-3 show obvious red-shifts compared with those of the corresponding 2-phenylpyridyl (ppy) containing Ir(III) complexes ([Ir(ppy)2Cl] 2, Ir(ppy)2(PPh3)Cl and Ir(ppy) 2(pic)) in which no strongly electron-withdrawing nitro groups are introduced to the pyridyl rings of the ppy ligands. Thus, the HOMO-LUMO energy gaps of 1-3 should be narrower than those of [Ir(ppy)2Cl] 2, Ir(ppy)2(PPh3)Cl and Ir(ppy) 2(pic).
AB - A series of new 2-phenyl-5-nitropyridyl containing iridium(III) cyclometalated complexes ([Ir(5-NO2-ppy)2Cl]2 (1, 5-NO2-ppy = 2-phenyl-5-nitropyridyl), Ir(5-NO2-ppy) 2(PPh3)Cl (2, PPh3 = triphenylphosphine), Ir(5-NO2-ppy)2(pic) (3, pic = picolinic acid)) have been synthesized and unambiguously characterized. The crystal structures of 2 and 3 have been determined by X-ray diffraction analyses. The HOMO-LUMO energy gaps of 1-3 estimated by the cyclic voltammetry (CV) show values in the order of 2 > 3 > 1. The UV-vis absorption and the solid photoluminescence (PL) spectra of 1-3 have also been measured, exhibiting the changing orders being consistent with that of the HOMO-LUMO energy gaps. Moreover, the UV-vis absorption spectra of 1-3 show obvious red-shifts compared with those of the corresponding 2-phenylpyridyl (ppy) containing Ir(III) complexes ([Ir(ppy)2Cl] 2, Ir(ppy)2(PPh3)Cl and Ir(ppy) 2(pic)) in which no strongly electron-withdrawing nitro groups are introduced to the pyridyl rings of the ppy ligands. Thus, the HOMO-LUMO energy gaps of 1-3 should be narrower than those of [Ir(ppy)2Cl] 2, Ir(ppy)2(PPh3)Cl and Ir(ppy) 2(pic).
KW - 2-Phenyl-5-nitropyridyl
KW - Crystal structure
KW - Electron-withdrawing group
KW - HOMO-LUMO energy gap
KW - Iridium(III) complex
KW - Red-shift
UR - http://www.scopus.com/inward/record.url?scp=79960836831&partnerID=8YFLogxK
U2 - 10.1016/j.inoche.2011.06.010
DO - 10.1016/j.inoche.2011.06.010
M3 - 文章
AN - SCOPUS:79960836831
SN - 1387-7003
VL - 14
SP - 1511
EP - 1515
JO - Inorganic Chemistry Communications
JF - Inorganic Chemistry Communications
IS - 9
ER -