A THEORETICAL STUDY ON DUAL FLUORESCENCE OF 4-DIMETHYLAMINOPYRIDINE BY POLARIZABLE CONTINUUM MODEL

A THEORETICAL STUDY ON DUAL FLUORESCENCE OF 4-DIMETHYLAMINOPYRIDINE BY POLARIZABLE CONTINUUM MODEL
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偏振连续体模型对4-二甲基氨基吡啶双荧光的理论研究

DOI:
10.1142/s0219633608004143
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发表时间:
2008-08
影响因子:
2.4
通讯作者:
Li, Juan-Qin
Li, Juan-Qin
中科院分区:
化学4区
文献类型:
--
作者:
Li, Xiang-Yuan;Wang, Feng;Li, Juan-Qin

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使用时间相关密度泛函理论和完整活性空间自洽场方法研究了 4-二甲氨基吡啶 (DMAP) 的双荧光光谱。在环己烷、氯仿和乙腈三种溶剂中研究了 DMAP 的电子吸收和发射光谱。本研究表明,DMAP 的双荧光现象出现在乙腈和氯仿中,但在环己烷中则没有。因此,研究基态的电子结构和分子内电荷转移态,以揭示双荧光的见解。我们的理论结果表明,DMAP 中二甲氨基部分的扭曲对于分子内电荷转移是必要的。基于扭曲的分子内电荷转移模型讨论了DMAP双荧光的机理,并从理论上解释了双荧光现象。
Dual fluorescence spectra of 4-dimethylaminopyridine (DMAP) is investigated using time-dependent density functional theory and complete active space self-consistent field methods. Electronic absorption and emission spectra of DMAP have been investigated in three solvents, that is, cyclohexane, chloroform, and acetonitrile. The present study reveals that the dual fluorescence phenomena of DMAP appear in the cases of acetonitrile and chloroform, but not in cyclohexane. The electronic structures of the ground state and the intramolecular charge transfer states are, therefore, studied in order to reveal the insight of dual fluorescence. Our theoretical results suggest that the twisting of dimethylamino moiety in DMAP is necessary for the intramolecular charge transfer. The mechanism of the dual fluorescence of DMAP is discussed based on the twisted intramolecular charge transfer model and the dual fluorescence phenomenon is explained theoretically.
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发表时间: 1996-08
影响因子: 2.8
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