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| 摘要：本文合成并表征了以1-苯基吡唑为第一配体，2-(2’-羟基苯基)苯并噻唑及其衍生物为辅助配体，以铱为内核的新型配合物(ppz)2Ir(LX)（ppz＝1-苯基吡唑，LX＝2-(2’-羟基苯基)苯并噻唑BTZ，2-(3’-甲基-2’-羟基苯基)苯并噻唑3-MeBTZ，2-(4’-甲基-2’-羟基苯基)苯并噻唑4-MeBTZ，2-(4’-三氟甲基-2’-羟基苯基)苯并噻唑4-tfmBTZ）。并对其分子结构，光物理性能及电化学性能进行了测试和比较分析。实验结果表明：四种配合物有着基本相同的紫外吸收光谱和激发光谱，四种配合物的荧光发射光谱也类似，最大发光峰分布在583nm—615nm，都在400nm左右存在一个弱的光发射，而且发射主要来源于配体的光吸收，而不是3MLCT及3π-π﹡跃迁。与Ir(ppz)3相比，不仅实现了室温磷光，也通过第二配体的修饰实现了对发光颜色的调制，表明配合物内存在着环金属化配体到辅助配体的能量转移。400nm的弱发射被认为是金属离子微扰的辅助配体BTZ的单重态激子的辐射跃迁，而长波段的光发射被认为是Ir(BTZ)的3MLCT的三重态激子的辐射跃迁。 |
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goodtimega
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| Abstract: This paper reports the synthesized and characterized 1 - phenyl-pyrazole as the first ligand, 2 - (2'-hydroxyphenyl) benzothiazole and its derivatives for the auxiliary ligand, which are a new kernel with the Iridium objects (ppz) 2Ir (LX) (ppz = 1 - phenyl-pyrazole, LX = 2 - (2'-hydroxyphenyl) benzothiazole BTZ, 2 - (3'-methyl -2 '- hydroxyphenyl ) benzothiazole 3-MeBTZ, 2 - (4'-methyl -2 '- hydroxyphenyl) benzothiazole 4-MeBTZ, 2 - (4'-trifluoromethyl -2' - hydroxyphenyl) benzene thiazole 4-tfmBTZ). The cooresponding molecular structure, photophysical and electrochemical properties were tested and analyzed comparatively. The results show that four kinds of complexes have essentially the same UV absorption spectra. The excitation spectra of four kinds of complexes have similar fluorescence emission spectra of the maximum emission peak located in 583-615nm, about 400nm are in the presence of a weak optical emission. The emission comes mainly from the light absorption of ligand, rather than 3MLCT and 3π-π * transitions. On the other hand, Ir (ppz) 3, compared not only realized at room temperature phosphorescence, but also through the second modification of ligand to achieve the modulation of luminous color. This indicates that there exists a ring of metal-based ligands to the ligand-assisted energy transfer. The observed 400nm emission is attributed to a weak perturbation of the auxiliary metal ion ligands BTZ of the singlet exciton radiative transition, while the long wavelength of light emission is attributed to Ir (BTZ) of the 3MLCT triple exciton transition radiation. |
20楼2009-09-27 02:26:11
yuyang031985
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2楼2009-09-13 13:00:32
wangwei2008
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3楼2009-09-13 16:56:34
luqing6879
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5楼2009-09-13 17:34:06
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