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Revised excited-state intramolecular proton transfer of the 3-Aminophthalimide molecule: A TDDFT study.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.3 ) Pub Date : 2020-05-06 , DOI: 10.1016/j.saa.2020.118386
Bo Li 1 , Qiao Zhou 1 , Chaofan Sun 1 , Bifa Cao 1 , You Li 1 , Jianhui Han 1 , Hang Yin 1 , Ying Shi 1
Affiliation  

The spectroscopic properties of 3-Aminophthalimide (3AP) molecule were investigated [Chem. Phys. 2002, 283, 249, New J. Chem. 2018, 42, 1181]. The result was that the 3AP molecule was exhibiting excited-state intramolecular proton transfer (ESIPT). In the research, we revised previous result using time-dependent density functional theory (TDDFT) method. The fluorescence spectrum shows that the only fluorescence peak is from initial enol form, which is different from the traditional case of ESIPT. The red shift of characteristic peaks in infrared vibration spectra is not induced by ESIPT process. The change in the vibration mode of the amino group causes the red shift of characteristic peak in the infrared spectrum. Energy curves indicate that the barrier (19.71 kcal/mol) is anomalously high in the first excited state. In addition, there are not stable points to lead the ESIPT to form a keto isomer. Together, these results demonstrate that there is not an ESIPT process happening of 3AP molecule.

中文翻译:

修订版的3-氨基邻苯二甲酰亚胺分子的激发态分子内质子转移:TDDFT研究。

研究了3-氨基邻苯二甲酰亚胺(3AP)分子的光谱性质。物理 2002,283,249,New J.Chem。2018,42,1181]。结果是3AP分子表现出激发态的分子内质子转移(ESIPT)。在研究中,我们使用时变密度泛函理论(TDDFT)方法修改了先前的结果。荧光光谱显示,唯一的荧光峰来自初始烯醇形式,这与传统的ESIPT情况不同。ESIPT过程不会引起红外振动光谱中特征峰的红移。氨基的振动模式的改变引起红外光谱中特征峰的红移。能量曲线表明,在第一激发态下,势垒(19.71 kcal / mol)异常高。此外,没有稳定的点可导致ESIPT形成酮异构体。在一起,这些结果表明3AP分子没有发生ESIPT过程。
更新日期:2020-05-06
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