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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Luminescent organic dyes containing a phenanthro[9,10-]imidazole core and [Ir complexes based on the cyclometalating and diimine ligands of this type
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Luminescent organic dyes containing a phenanthro[9,10-]imidazole core and [Ir complexes based on the cyclometalating and diimine ligands of this type

机译：发光有机染料，含有苯颜六种咪唑核和[IR复合物，基于这种类型的环荷环化和二嘧啶配体

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摘要

A family of diimine (N<^>N) and cyclometalating (N<^>C) ligands based on a phenanthro-imidazole aromatic system: 2-pyridyl-1H-phenanthro[9,10-d]imidazole (N<^>N); 2-R-1-phenyl-1H-phenanthro[9,10-d]imidazole, R = phenyl (N<^>C4), 3-iodophenyl (N<^>C5) and 4-nitrophenyl (N<^>C6) were prepared. It was found that N<^>C4 and N<^>C5 show pi-pi* fluorescence typical of aromatic systems of this sort, whereas the donor-acceptor architecture of N<^>C6 leads to strong emission solvatochromism and acidochromism, indicating the charge transfer character of the fluorescence observed. Six iridium(iii) complexes (1-6) [Ir(N<^>C#)(2)(N<^>N)](+), where # = 1-6 and N<^>C1 = 2-phenylpyridine, N<^>C2 = 2-(benzo[b]thiophen-2-yl)pyridine, and N<^>C3 = methyl 2-phenylquinoline-4-carboxylate, were also synthesized and characterized. The complexes obtained display moderate to bright phosphorescence with quantum yields up to 46% in degassed solution. The photophysical characteristics of 1-6 were studied in detail. DFT and TD DFT calculations were used for the assignment of electronic transitions responsible for the absorption and emission of these compounds. The variations in the cyclometalating ligand structure give rise to rich photophysics of the complexes obtained. It was found that the orbitals of both N<^>C and N<^>N ligands make a major contribution to the formation of emissive excited states and a delicate balance between the energy of the ligands' frontier orbitals determines the emission character.
机译：基于菲亚咪唑芳族系统的二亚胺（N + N）和环荷环化（n ^℃）配体：2-吡啶基-1H-菲唑[9,10-D]咪唑（n <^> n）; 2-R-1-苯基-1H-菲唑[9,10-D]咪唑，R =苯基（N ^ C4），3-碘苯（n ^ C5）和4-硝基苯（n <^> C6）制备。发现n ^ c4和n ^ c5显示出这种芳族系统的pi-pi *荧光，而n <^> c6的供体占架构导致强度的发射溶剂质和acidochromism，表明观察到荧光的电荷转移特征。六铱（III）复合物（1-6）[IR（n <^> c＃）（2）（n <^> n）]（+），其中＃= 1-6和n <^> c1 = 2-苯基吡啶，N + C 2 = 2-（苯并[B]噻吩-2-基）吡啶，也合成并表征N + C 3 =甲基2-苯基喹啉-4-羧酸甲酯。将复合物获得中等至亮磷光的含量高达46％的脱气溶液。详细研究了1-6的光物理特征。 DFT和TD DFT计算用于分配负责这些化合物的吸收和排放的电子转换。环芯配体结构的变化产生了所获得的复合物的富含光学药物。发现N <^> c和n ^ ^ n配体的轨道对形成发光兴奋状态的主要贡献以及配体的前沿轨道的能量之间的微妙平衡决定了排放特征。

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