Time-resolved fluorescence spectroscopy for studying stepwise excited-state intramolecular double proton transfer

IF 3.3 3区 物理与天体物理 Q2 OPTICS Journal of Luminescence Pub Date : 2023-11-01 DOI:10.1016/j.jlumin.2023.120032
Dzmitryi Ushakou
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用于研究分子内逐步激发态双质子转移的时间分辨荧光光谱
目前,单激发态分子内质子转移(ESIPT)得到了较好的研究和广泛的报道。然而,激发态多分子内质子转移直到近十年才得到深入的研究。现在,人们对各种分子中发生的单一和多个ESIPT过程越来越感兴趣,因为它为将这些化合物应用于化学传感器、分子开关、近红外发射器件和高荧光液晶提供了很大的机会。阶梯式激发态分子内双质子转移(ESIDPT)就是其中的一种。与单次ESIDPT类似,阶梯式ESIDPT也通过分子内氢键的方式发生。但在逐步ESIDPT中,由于初始分子结构中只有一个质子转移位点,两个质子转移在一个分子中依次发生。然后,在第一个ESIPT之后,一个额外的质子转移位点出现,第二次质子转移将发生。在这项工作中,从时间分辨荧光光谱的角度研究了esidpt活性分子的逐步发射。在六态模型的基础上讨论了辐射衰减的理论模型。该模型由正常分子形态的三对基态和激发态和两个互变异构体组成。它可以得到发射衰减函数的三指数方程。结果表明,对荧光衰减曲线的彻底分析可以估计出每种激发分子形式的总衰减速率常数。通过数值模拟验证了该模型的有效性。实验数据也从模型的角度进行了讨论。
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来源期刊
Journal of Luminescence
Journal of Luminescence 物理-光学
CiteScore
6.70
自引率
13.90%
发文量
850
审稿时长
3.8 months
期刊介绍: The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.
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