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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Proton Phototransfers in Doubly Hydrogen Bonded Dimers: The Photophysics of 6,7,8,9-Tetrahydro-5H-pyrido[2,3-b]indole Dimers
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Proton Phototransfers in Doubly Hydrogen Bonded Dimers: The Photophysics of 6,7,8,9-Tetrahydro-5H-pyrido[2,3-b]indole Dimers

机译：氢键键合二聚体中的质子光转移：6,7,8,9-四氢-5H-吡啶并[2,3-b]吲哚二聚体的光物理

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摘要

A photophysical study of 6,7,8,9-tetrahydro-5H-pyrido[2,3-b]indole dissolved in 2-methylbutane at decreasing temperatures from 293 to 93 K revealed the presence of two different fluorescence emissions due to doubly hydrogen-bonded dimers of the monomer species. One of the emissions is assigned to the normal tautomer form of the dimer of C_2 symmetry, and the other is mostly assigned to the most stable dimer, which is nonsymmetric (C_1) and exhibits single-proton transfer upon electronic excitation. As shown here, when the doubly hydrogen-bonded 7-azaindole dimer loses its centrosymmetry, by fusing a six-membered ring to the molecular structure, its first excited electronic state does not undergo a double-proton transfer but rather a single proton transfer, which, in a fluid medium, causes the dimer to dissociate; if the medium can trap the resulting excited structure, then the compound exhibits fluorescence in the 410 nm region, which is typical of its protonated or deprotonated forms.
机译：在从293到93 K的降低温度下，对溶解于2-甲基丁烷中的6,7,8,9-四氢-5H-吡啶并[2,3-b]吲哚的光物理研究表明，由于存在双氢，存在两种不同的荧光发射-单体种类的键合二聚体。发射物中的一种分配给C_2对称二聚体的正常互变异构体形式，另一种分配给最稳定的二聚体，这是不对称的（C_1），在电子激发下表现出单质子转移。如此处所示，当氢键结合的7-氮杂吲哚二聚体失去六点对称性时，通过将六元环融合到分子结构上，其第一个激发电子态不会经历双质子转移，而是经历单质子转移，在液体介质中导致二聚体解离;如果介质可以捕获得到的激发结构，则该化合物在410 nm区域显示荧光，这是其质子化或去质子化形式的典型特征。

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