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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Structure and Photophysics of 2-(2'-Pyridyl)benzindoles:The Role of Intermolecular Hydrogen Bonds
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Structure and Photophysics of 2-(2'-Pyridyl)benzindoles:The Role of Intermolecular Hydrogen Bonds

机译：2-（2'-吡啶基）苯并吲哚的结构和光物理性质：分子间氢键的作用

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摘要

The photophysical properties of two isomeric 2-(2'-pyridyl)benzindoles depend on the environment.Strong fluorescence is detected in nonpolar and polar aprotic solvents.In the presence of alcohols,the emission reveals an unusual behavior.Upon titration of n-hexane solutions with ethanol,the fluorescence intensity goes through a minimum and then increases with rising alcohol concentration.Transient absorption and time-resolved emission studies combined with ground-and excited-state geometry optimizations lead to the conclusion that two rotameric forms,syn and anti,coexist in alcohols,whereas in nonpolar and aprotic polar media,only the syn conformation is present.The latter can form cyclic complexes with alcohols,which are rapidly depopulated in the excited state.In the presence of excess alcohol,syn->anti rotamerization occurs in the ground state,promoted by the cooperative action of nonspecific and specific effects such as solvent polarity increase and the formation of hydrogen bonds to both donor and acceptor sites of the bifunctional compounds.
机译：两种异构的2-（2'-吡啶基）苯并吲哚的光物理性质取决于环境。在非极性和极性非质子传递溶剂中检测到强荧光。在醇存在下，发射显示出不寻常的行为。正己烷滴定时在乙醇溶液中，荧光强度经过一个最小值，然后随着酒精浓度的增加而增加。瞬态吸收和时间分辨发射研究与基态和激发态几何优化相结合，得出以下结论：正，反两个旋转异构体，在醇中共存，而在非极性和非质子极性介质中，仅存在顺式构象。后者可与醇形成环状配合物，并在激发态下迅速消失。在过量醇的存在下，发生syn->反旋转在基态下，由于非特异性和特定作用（例如溶剂极性增加和氢键的形成）的协同作用而促进o双功能化合物的供体和受体位点。

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