Two cationic iridium（Ⅲ） complexes, [（pqcm）2Ir（pybz）]（PF6） （Ir1） and [（pqcm）2Ir（apybz）]（PF6） （Ir2） （pqcmH = 2-phenyl-quinoline-4-carboxylic acid methyl ester, pybz = 2-pyridyl-benzimidazole, apybz =...Two cationic iridium（Ⅲ） complexes, [（pqcm）2Ir（pybz）]（PF6） （Ir1） and [（pqcm）2Ir（apybz）]（PF6） （Ir2） （pqcmH = 2-phenyl-quinoline-4-carboxylic acid methyl ester, pybz = 2-pyridyl-benzimidazole, apybz = 1-allyl-2-pyridyl-benzimidazole）, were readily synthesized from the reaction of IrⅢ-μ-chloro-bridged dimer [Ir（pqcm）2（Cl）]2 and corresponding ancillary ligands, and characterized by NMR and mass spectroscopies. The structure of It2 was also confirmed by single-crystal X-ray diffraction. The photophysical properties of the two complexes were also investigated. Irl shows deep red emission peaked at around 652 nm with the phosphorescence quantum yield of ca. 0.29 and the emission lifetime of 233 ns, while Ir2 shows red emission peaked at around 615 nm with the phosphorescence quantum yield of ca. 0.13 and the emission lifetime of 430 ns. The active hydrogen on pybz ligand is believed to have a great influence on the photophysical properties of Ir1.展开更多
The interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA has been studied by UV-Vis spectral, Fluorescence spectral in buffer solution of Tris-HCl (pH=7.25) using Neutral Red (NR) as a probe. The intercalati...The interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA has been studied by UV-Vis spectral, Fluorescence spectral in buffer solution of Tris-HCl (pH=7.25) using Neutral Red (NR) as a probe. The intercalation and electrostatic manner are confirmed to be the two major modes for interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA. The balance constant of Sm(Ⅲ)(MTB)2 rare earth metal complex and Herring Sperm DNA is K=4.10 × 104 L·mol-1. The results indicate that biological functions of Herring Sperm DNA are changed to a certain extend due to the interaction between Sm(Ⅲ)(MTB)2 rare earth metal complex and Herring Sperm DNA.展开更多
合成了一种铱配合物[Ir(N4)(MDFPPM)2](MDFPPM=4,6-二甲基-2-(2,4-二氟苯基)嘧啶,N4=5-(2-吡啶基)-1H-四唑),并利用X射线单晶衍射仪测定了该化合物的2种晶体结构。通过紫外-可见(UV-Vis)吸收光谱、荧光光谱、循环伏安法及含时密度泛函理...合成了一种铱配合物[Ir(N4)(MDFPPM)2](MDFPPM=4,6-二甲基-2-(2,4-二氟苯基)嘧啶,N4=5-(2-吡啶基)-1H-四唑),并利用X射线单晶衍射仪测定了该化合物的2种晶体结构。通过紫外-可见(UV-Vis)吸收光谱、荧光光谱、循环伏安法及含时密度泛函理论(TD-DFT)对其光物理性能及能级结构进行了研究。结果表明:2个晶体的空间构型均为单斜,空间群均为P21/c;Ir(N4)(MDFPPM)2的最高占据轨道(HOMO)主要定域于金属Ir(Ⅲ)和配体MDFPPM的苯环上,最低未占有轨道(LUMO)主要定域于配体MDFPPM的嘧啶环上;配合物Ir(N4)(MDFPPM)2的HOMO和LUMO能级分别为-5.98和-3.22 e V;Ir(N4)(MDFPPM)2在77 K乙腈溶液中的发射峰波长在449、480和513 nm,CIEx,y色度坐标为(0.15,0.23),是一种潜在的蓝色磷光材料。展开更多
基金financially supported by the National Natural Science Foundation of China (No. 50903001)the Guangxi Department of Education research project (200911MS281, 200911MS282)
文摘Two cationic iridium（Ⅲ） complexes, [（pqcm）2Ir（pybz）]（PF6） （Ir1） and [（pqcm）2Ir（apybz）]（PF6） （Ir2） （pqcmH = 2-phenyl-quinoline-4-carboxylic acid methyl ester, pybz = 2-pyridyl-benzimidazole, apybz = 1-allyl-2-pyridyl-benzimidazole）, were readily synthesized from the reaction of IrⅢ-μ-chloro-bridged dimer [Ir（pqcm）2（Cl）]2 and corresponding ancillary ligands, and characterized by NMR and mass spectroscopies. The structure of It2 was also confirmed by single-crystal X-ray diffraction. The photophysical properties of the two complexes were also investigated. Irl shows deep red emission peaked at around 652 nm with the phosphorescence quantum yield of ca. 0.29 and the emission lifetime of 233 ns, while Ir2 shows red emission peaked at around 615 nm with the phosphorescence quantum yield of ca. 0.13 and the emission lifetime of 430 ns. The active hydrogen on pybz ligand is believed to have a great influence on the photophysical properties of Ir1.
文摘The interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA has been studied by UV-Vis spectral, Fluorescence spectral in buffer solution of Tris-HCl (pH=7.25) using Neutral Red (NR) as a probe. The intercalation and electrostatic manner are confirmed to be the two major modes for interaction between Sm(Ⅲ)(MTB)2 complex and Herring Sperm DNA. The balance constant of Sm(Ⅲ)(MTB)2 rare earth metal complex and Herring Sperm DNA is K=4.10 × 104 L·mol-1. The results indicate that biological functions of Herring Sperm DNA are changed to a certain extend due to the interaction between Sm(Ⅲ)(MTB)2 rare earth metal complex and Herring Sperm DNA.
文摘合成了一种铱配合物[Ir(N4)(MDFPPM)2](MDFPPM=4,6-二甲基-2-(2,4-二氟苯基)嘧啶,N4=5-(2-吡啶基)-1H-四唑),并利用X射线单晶衍射仪测定了该化合物的2种晶体结构。通过紫外-可见(UV-Vis)吸收光谱、荧光光谱、循环伏安法及含时密度泛函理论(TD-DFT)对其光物理性能及能级结构进行了研究。结果表明:2个晶体的空间构型均为单斜,空间群均为P21/c;Ir(N4)(MDFPPM)2的最高占据轨道(HOMO)主要定域于金属Ir(Ⅲ)和配体MDFPPM的苯环上,最低未占有轨道(LUMO)主要定域于配体MDFPPM的嘧啶环上;配合物Ir(N4)(MDFPPM)2的HOMO和LUMO能级分别为-5.98和-3.22 e V;Ir(N4)(MDFPPM)2在77 K乙腈溶液中的发射峰波长在449、480和513 nm,CIEx,y色度坐标为(0.15,0.23),是一种潜在的蓝色磷光材料。
