片段间电荷转移染料的光谱性质:2-(3-香豆醇基)-高氯酸苯并吡啶的溶剂变色和溶剂荧光变色

E. V. Sanin, A. I. Novikov, A. Roshal
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引用次数: 1

摘要

本文研究了具有片段间电荷转移的染料的光谱性质,特别是高氯酸盐2-(3-香豆醇基)苯并吡啶(CBP)衍生物。主要在非质子溶剂中测量了长波吸收和发射带的位置、量子产率和荧光寿命。对CBP的光谱特征与主要溶剂参数(极性、极化性、亲核性和亲电性)之间的关系进行了回归分析。结果表明,CBP的性质主要取决于极性和亲核性两个溶剂参数。这些参数的增加导致吸收带的次色移和寿命和荧光强度的降低。根据取代基的性质,发射带的位置可以表现为浅显色或深显色。溶剂化致荧光效应不如溶剂化致荧光效应强。我们认为CBP的光谱行为可以用阳离子去极化和与溶剂分子的亲核配合物稳定性的降低来解释,这与激发态激发、弛豫和辐射失活后碎片间电荷转移有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spectral Properties of Dyes with Interfragmental Charge Transfer: Solvatochromism and Solvatofluorochromism of 2-(3-Coumaroyl)-benzopyrylium Perchlorates
The paper deals with the spectral properties of dyes with interfragmental charge transfer, in particular, derivatives of 2-(3-coumaroyl)benzopyrylium (CBP) perchlorates. The positions of long-wavelength absorption and emission bands, quantum yields, and lifetimes of fluorescence were measured, mostly in aprotic solvents. Regression analysis of the relationship between the spectral characteristics of CBP and the main solvent parameters (polarity, polarisability, nucleophilicity, and electrophilicity) was carried out. It was found that the characteristics of CBP depend mainly on two solvent parameters—polarity and/or nucleophilicity. An increase in these parameters results in a hypsochromic shift of absorption bands and a decrease of lifetimes and fluorescence intensity. The positions of the emission bands can demonstrate either hypsochromism or bathochromism, depending on the nature of the substituents. The solvatofluorochromic effects are not as strong as the solvatochromic ones. We believe that the spectral behaviour of CBP can be explained by cation depolarisation and by a decrease in the stability of nucleophilic complexes with solvent molecules that is associated with interfragmental charge transfer following excitation, relaxation, and radiative deactivation of the excited state.
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