Synthesis and Photophysical Properties of Substituted Tris(phenylbenzimidazolinato) IrIII Carbene Complexes as a Blue Phosphorescent Material
作者： Kazuyoshi Tsuchiya , Shiki Yagai , Akihide Kitamura , Takashi Karatsu , Kyoko Endo
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摘要: Substitution effects on the photoluminescence and electrochemical properties photochemical stability of tris-(phenylbenzimidazolinato)Ir III complexes were investigated. Facial meridional isomers a series having general structure Ir(CC) 3 , where (CC) is (4-R-phenyl)benzimidazolinato (R = H, CF CN, OCH ), prepared. They are abbreviated to Ir(pmb) (1), Ir(CF pmb) (2), Ir(CNpmb) (3), Ir(Opmb) (4), respectively. Electron-donating or -withdrawing groups phenyl ring lead both higher emission quantum yields longer lifetimes compared those 1 in each mer fac series. Particularly, high cases 2a, 3a, 3b, 4a. No isomerization was observed fac- (a) (b) Ir(CF3pmb) irradiation with 313-nm wavelength light from 400 W mercury lamp for more than 20 h. All excluding facIr(pmb) (1a) show excellent degassed anhydrous thf solution. The locations HOMO LUMO lowest excitation energy these investigated by DFT TD-DFT calculations mer-Ir(Opmb) (4a 4b). mainly localized over Ir metal center moiety, benzimidazole moiety. calculated energies agree experimental values. X-ray single crystal structures obtained fac-Ir(CF (2a) (4b) also discussed.
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