溶液中双极性分子转子的激发波长和浓度依赖性光物理行为:结构修饰的作用

Arivalagan Shabashini, Anas D Fazal, Dr. Sumit Kumar Panja, Ganesh Chandra Nandi
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引用次数: 0

摘要

本研究表明,通过对分子进行结构改造,可以实现扭曲分子内电荷转移(TICT)和分子内电荷转移(ICT)过程。DMMC (2-(4-(二甲基氨基)亚苄基)丙二腈)和 DMDC (2-(4-(二甲基氨基)亚苄基)丙二腈)通过基态结构修饰分别呈现出 TICT 和 ICT 状态。通过比较局部激发(LE)和 ICT 发射带的相对强度,并根据激发波长和浓度进行研究,监测了这些分子随溶剂变化而增强的荧光。有趣的是,在 H2O 中进行激发波长和浓度依赖性研究时也观察到了聚集行为。此外,还观察到荧光特性的淬灭和增强与溶剂和激发波长有关。双极性状态和分子取向可能在溶液中的激发和浓度依赖性荧光过程中发挥了重要作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Excitation Wavelength and Concentration Dependent Photophysical behaviour of Dipolar Molecular rotors in Solution: Role of Structural Modification
The present work demonstrates that the twisted intramolecular charge transfer (TICT) and Intramolecular charge transfer (ICT) process can be achieved by structural modification of a molecule. The DMMC (2-(4-(dimethylamino)benzylidene)malononitrile) and DMDC (2-(4-(dimethylamino)benzylidene)malononitrile) exhibit TICT and ICT state respectively via structural modification at the ground state. Solvent-dependent fluorescence enhancement of these molecules is monitored by comparing the relative intensity of locally excited (LE) and ICT emission band from excitation wavelength and concentration-dependent study.Both molecules display the ICT emission process at excited state depending upon excitation wavelength and concentration in solution. Interestingly, aggregation behaviour is also observed during excitation wavelength and concentration-dependent study in H2O. Solvent and excitation wavelength-dependent quenching and enhancement of fluorescence properties are also observed. Dipolar state and molecular orientation may play an important role in excitation and concentration-dependent fluorescence process in solution.
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