4-CBppy (1); 5-CBppy (2), 4-fppy (4) CB = ortho-methylcarborane; ppy = 2-phenylpyridinato-C2,N, 4-fppy = 2-(4-fluorophenyl)pyridinato-C2,N, acac = acetylacetonate) complexes were prepared and characterized. While 1 exhibits a phosphorescence band centered at 531 nm, which is red-shifted compared to that of unsubstituted (ppy)2Ir(acac) (3) (λem = 516 nm), the emission spectrum of 2 shows a blue-shifted
杂(Ç ∧ Ñ)2的Ir(A
CAC)(ç ∧ Ñ = 4- CBppy(1); 5- CBppy(2),4- fppy(4)CB =邻-methylcarborane; PPY = 2-苯基-C 2,N,4- fppy = 2-(4-
氟苯基)
吡啶-C 2,N,A
CAC =
乙酰丙酮化物)的制备和表征复合物。虽然1展示了一个以531 nm为中心的
磷光带,但与未取代的
磷光带相比,该光带发生了红移(ppy)2 Ir(a
CAC)(3)(λem = 516 nm),发射光谱2显示在503 nm处出现蓝移带。与4-
氟取代的4(λem = 493 nm)的发射谱带的比较表明,1中存在显着的红移。电
化学和理论研究表明,尽管在苯环的4位上进行碳
硼烷取代会降低3 MLCT能量,这主要归因于最低的未占据分子轨道(LUMO)离域化,从而将最低的三重态1定义为[d π(IR)→π*(ç ∧ ñ)]由于具有3 MLCT