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Photophysical Properties of 4′-(p-aminophenyl)-2,2′:6′,2′′-terpyridine
Peng Song,Shi-guo Sun,Pan-wang Zhou,Jian-yong Liu*,Yong-qian Xu,Xiao-jun Peng*
Author NameAffiliationE-mail
Peng Song State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China  
Shi-guo Sun State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China  
Pan-wang Zhou State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China  
Jian-yong Liu* State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, China beam@dicp.ac.cn 
Yong-qian Xu State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China  
Xiao-jun Peng* State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China pengxj@dlut.edu.cn 
Abstract:
Spectral and photophysical investigations of 4′-(p-aminophenyl)-2,2′:6′,2′′-terpyridine (APT) have been performed in various solvents with different polarity and hydrogen-bonding ability.The emission spectra of APT are found to exhibit dual fluorescence in polar solvents, which attributes to the local excited and intramolecular charge transfer states, respectively. The two-state model is proven out for APT in polar solvent by the time-correlated single photon counting emission decay measurement. Interestingly, the linear relationships of different emission maxima and solvent polarity parameter are found for APT in protic and aprotic solvents, because of the hydrogen bond formation between APT and alcohols at the amino nitrogen N25. Furthermore, the effects of the complexation of the metal ion with tpy group of APT and the hydrogen bond formation between APT with methanol at the terpyridine nitrogen N4—N8—N14 are also presented. The appearance of new long-wave absorption and fluorescence bands indicates that a new ground state of the complexes is formed.
Key words:  Dual fluorescence, Local excited state, Intramolecular charge transfer, Ter-pyridine, Complexation, Fluorescence decay
FundProject:
4′-(对-胺苯基)-2,2′:6′,2′′-三联吡啶光物理性质
宋朋,孙士国,周潘旺,刘建勇*,徐勇前,彭孝军*
摘要:
用稳态吸收和荧光光谱技术研究4′-(对-胺苯基)取代的三联吡啶配体(APT)分子在不同极性溶剂中的光谱和光物理性质. 在极性溶剂中APT分子存在着双荧光现象,它分别对应于局域激发态和分子内电荷转移态. APT分子的胺基N原子与醇类溶剂之间的氢键作用使该分子在质子性与非质子性溶剂中具有不同的线性关系. 此外,APT分子的三联吡啶部分与锌离子络合以及三联吡啶N4—N8—N14与甲醇分子形成氢键后,在低能区域出现新的吸收光谱带与荧光光谱带,表明在基态和激发态均形成了新的络合物. 时间分辨单光子计数技术测量的APT分子的荧光衰减过程,证明了APT分子的分子内电荷转移机制符合〝两态〞模型.
关键词:  双荧光,局域激发态,分子内电荷转移,三联吡啶,复合物,荧光衰减
DOI:10.1088/1674-0068/23/05/558-564
分类号: