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首页> 外文期刊>Chemical Physics Letters >A time-dependent density-functional theory investigation of the fluorescence behavior of related cyano and di-cyano isomers of 4-(N, N-dimethylamino) benzonitrile
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A time-dependent density-functional theory investigation of the fluorescence behavior of related cyano and di-cyano isomers of 4-(N, N-dimethylamino) benzonitrile

机译:随时间变化的密度泛函理论研究4-(N,N-二甲基氨基)苄腈的相关氰基和二氰基异构体的荧光行为

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摘要

We present a time-dependent density-functional theory investigation of the absorption and emission energies for 2-CDMA, 3,5-DCDMA, and 3,4-DCDMA. Ground state geometries were optimized using density functional theory (DFT). Using the TICT (twisting intramolecular charge transfer) model to investigate the potential energy surface, we find that the non-dual fluorescence experimentally observed for all systems is explained by the presence of a large energy gap between the first and the second excited states. Our previous classification [submitted to JACS] established within the TICT model for this family of compounds also holds for the present systems. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 31]
机译:我们提出了一种随时间变化的密度泛函理论,对2-CDMA,3,5-DCDMA和3,4-DCDMA的吸收和发射能量进行了研究。使用密度泛函理论(DFT)优化了基态的几何形状。使用TICT(扭曲的分子内电荷转移)模型研究势能表面,我们发现实验观察到的所有系统的非双重荧光是由在第一和第二激发态之间存在较大的能隙引起的。在TICT模型中针对该化合物家族建立的我们先前的分类(提交JACS)也适用于当前系统。 (C)2002 Elsevier Science B.V.保留所有权利。 [参考:31]

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