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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Regular Fluorescence of 4-Fluoro-N,N-dimethylaniline: No Charge Transfer and No Twisting
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Regular Fluorescence of 4-Fluoro-N,N-dimethylaniline: No Charge Transfer and No Twisting

机译:4-氟-N,N-二甲基苯胺的常规荧光:无电荷转移,没有扭曲

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摘要

Recently, two contradicting experimental investigations have been published on the fluorescence behavior of 4-fluoro-N,N-dimethylaniline (FDMA). Motivated by the discrepancies between these studies, we have examined the deactivation pathways of photoexcited FDMA using high-level quantum chemical methods such as time-dependent density functional theory (TDDFT), coupled cluster (CC2) theory, and the algebraic diagrammatic construction scheme (ADC(2), ADC(3)) simulating solvation using continuum solvation models. Our results show the initial population of the bright S-2 (pi pi*) state of FDMA relax to a linear, almost So planar S-1 state minimum from which emission occurs. Our study further reveals that TDDFT/B3LYP erroneously predicts a planar twisted intramolecular charge transfer (TICT) S-1 state minimum that vanishes when the amount of nonlocal Hartree-Fock exchange in the functional is increased.
机译:最近,已经发表了两种相对矛盾的实验研究,对4-氟-N,N-二甲基苯胺(FDMA)的荧光行为发表。 通过这些研究之间的差异,我们研究了使用高水平量子化学方法的光交换FDMA的停用途径,例如时间依赖性密度泛函理论(TDDFT),耦合簇(CC2)理论和代数示意图( ADC(2),ADC(3))使用连续溶解模型进行模拟溶剂。 我们的结果显示FDMA的明亮S-2(PI PI *)状态的初始群体放松到线性,几乎如此平面S-1状态发生在发射中。 我们的研究进一步揭示了TDDFT / B3LYP错误地预测平面扭曲的分子内电荷转移(TICT)S-1状态,当功能性中的非本体Hartree-lecock交换量增加时消失。

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