Synthesis, Structure, and Photophysical and Electrochemical Properties of Cyclometallated Iridium(III) Complexes with Phenylated Bipyridine Ligands
Synthesis, Structure, and Photophysical and Electrochemical Properties of Cyclometallated Iridium(III) Complexes with Phenylated Bipyridine Ligands
复制标题
DOI：
10.1002/ejic.200400418
复制
发表时间：
2005
影响因子：
2.3
通讯作者：
M. Lepeltier;Terence K.-M. Lee;K. K. Lo-K.;L. Toupet;H. Bozec;V. Guerchais
中科院分区：
文献类型：
--
作者：
M. Lepeltier;Terence K.-M. Lee;K. K. Lo-K.;L. Toupet;H. Bozec;V. Guerchais
合成了一系列阳离子二亚胺铱配合物[Ir（ppy-N，C）2（L-N，N）]（PF 6）[Hppy = 2-苯基吡啶; L = 4，4 ′-tBu 2dpbpy（1），4，4 ′-Me 2dpbpy（2），4，4 ′-Me 2 pbpy（3），4，4 ′-Me 2bpy（4）]，并研究了它们的物理化学性质和电化学性质。配合物1的X-射线衍射研究表明吡啶环之间的二面角约为33°，并且两个苯基也相对于相邻的吡啶环倾斜。所有的配合物表现出中等强度和长寿命的发射。发射的起源被暂时指定为三重金属-配体电荷转移3 MLCT [dπ（Ir）π*（diimine）]激发态，尽管不能排除三重σ-键-配体电荷转移3SBLCT [σ（Ir−C）π*（diimine）]的可能性。配合物的发光性质与二亚胺配体上的取代基有关。选择性N-甲基化的二亚胺配体已经实现，并已尝试其N，C-协调的Ir中心。（© Wiley-VCH Verlag GmbH & Co. KGaA，69451魏因海姆，德国，2005）
A series of cationic diiminoiridium(III) complexes [Ir(ppy-N,C)2(L-N,N)](PF6) has been prepared [Hppy = 2-phenylpyridine; L = 4,4′-tBu2dpbpy (1), 4,4′-Me2dpbpy (2), 4,4′-Me2pbpy (3), 4,4′-Me2bpy (4)] and their photophysical and electrochemical properties studied. X-ray diffraction studies of complex 1 reveal a dihedral angle of about 33° between the pyridine rings, and that the two phenyl groups are also tilted with respect to the adjacent pyridine rings. All the complexes exhibit moderately intense and long-lived emission. The origin of the emission is tentatively assigned to a triplet metal-to-ligand charge-transfer 3MLCT [dπ(Ir) π*(diimine)] excited state, although the possibility of a triplet σ-bond-to-ligand charge transfer 3SBLCT [σ(Ir−C) π*(diimine)] cannot be excluded. The luminescence properties of the complexes are dependent on the substituents on the diimine ligands. Selective N-methylation of the diimine ligands has been achieved and their N,C-coordination to the Ir centre has been attempted. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)