Jayabharathi J, Thanikachalam V, Kalaiarasi V, Jayamoorthy K
Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India.
Department of Chemistry, Annamalai University, Annamalainagar 608 002, Tamilnadu, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014;120:389-94. doi: 10.1016/j.saa.2013.10.017. Epub 2013 Oct 21.
This article presents optical, electrochemical, and thermal properties of novel class of green fluorescent 1-(4,5-diphenyl-1-p-tolyl-1H-imidazol-2-yl)naphthalen-2-ol. Detailed photo physical and quantum chemical studies have been performed to elucidate the excited state intramolecular proton transfer (ESIPT) reaction leading a large stokes shifted fluorescence emission from the phototautomer. The results of quantum chemical investigations confirmed the intramolecular charge transfer characteristics of the ESIPT tautomers. The high photoluminescence quantum yield is ascribed to twisted chromophores due to phenyl substituents at 1,2-position of the imidazole ring which restricted intramolecular motion, leading to an optically allowed lowest optical transition without self quenching.
本文介绍了新型绿色荧光1-(4,5-二苯基-1-对甲苯基-1H-咪唑-2-基)萘-2-醇的光学、电化学和热学性质。已进行了详细的光物理和量子化学研究，以阐明激发态分子内质子转移(ESIPT)反应，该反应导致光互变异构体产生大斯托克斯位移荧光发射。量子化学研究结果证实了ESIPT互变异构体的分子内电荷转移特性。高光致发光量子产率归因于咪唑环1,2位上的苯基取代基导致发色团扭曲，限制了分子内运动，从而产生了光学允许的最低光学跃迁且无自猝灭现象。
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