Behera Santosh Kumar, Karak Ananda, Krishnamoorthy G
Department of Chemistry, Indian Institute of Technology Guwahati , Guwahati 781039, India.
J Phys Chem B. 2015 Feb 12;119(6):2330-44. doi: 10.1021/jp5064808. Epub 2014 Nov 5.
Photophysical characteristics of 2-(4'-amino-2'-hydroxyphenyl)-1H-imidazo-[4,5-c]pyridine (AHPIP-c) have been studied in various aprotic and protic solvents using UV-visible, steady state fluorescence and time-resolved fluorescence spectroscopic techniques. To comprehend the competition between the intramolecular charge transfer (ICT) and the excited state intramolecular proton transfer (ESIPT) processes, the photophysical properties of 2-(4'-amino-2'-methoxyphenyl)-1H-imidazo-[4,5-c]pyridine (AMPIP-c) and 2-(4'-aminophenyl)-1H-imidazo-[4,5-c]pyridine (APIP-c) were also investigated. Though APIP-c displays twisted ICT (TICT) emission in protic solvents, AHPIP-c exhibits normal and tautomer emissions in aprotic as well as in protic solvents due to ESIPT. However, the methoxy derivative, AMPIP-c, emits weak TICT fluorescence in methanol.
使用紫外可见光谱、稳态荧光光谱和时间分辨荧光光谱技术，在各种非质子溶剂和质子溶剂中研究了2-(4'-氨基-2'-羟基苯基)-1H-咪唑并[4,5-c]吡啶(AHPIP-c)的光物理特性。为了理解分子内电荷转移(ICT)和激发态分子内质子转移(ESIPT)过程之间的竞争，还研究了2-(4'-氨基-2'-甲氧基苯基)-1H-咪唑并[4,5-c]吡啶(AMPIP-c)和2-(4'-氨基苯基)-1H-咪唑并[4,5-c]吡啶(APIP-c)的光物理性质。尽管APIP-c在质子溶剂中显示出扭曲的ICT(TICT)发射，但由于ESIPT，AHPIP-c在非质子溶剂和质子溶剂中均表现出正常和互变异构体发射。然而，甲氧基衍生物AMPIP-c在甲醇中发出微弱的TICT荧光。
