苯并咪唑
卤化
转身(生物化学)
荧光
化学
组合化学
光化学
有机化学
生物化学
量子力学
物理
作者
Murillo H. Queiroz,Tiago Vinicius Alves,Roberto Rivelino,Sylvio Canuto
出处
期刊:ACS omega
[American Chemical Society]
日期:2024-05-10
卷期号:9 (20): 22102-22111
被引量:3
标识
DOI:10.1021/acsomega.4c00488
摘要
This work reports a theoretical investigation of the solvent polarity as well as the halogenation of benzimidazole derivatives during excited state intramolecular proton transfer (ESIPT). It details how the environment and halogen substitution may contribute to the efficiency of ESIPT upon keto-enol tautomerism and exploits this effect to design fluorescence sensing. For this purpose, we first examine the conformational equilibrium of benzimidazole derivatives containing different halogen atoms, which results in intramolecular proton transfer, using density-functional theory (DFT) combined with the polarizable continuum model (PCM). Then we evaluate the fluorescence of the benzimidazole derivatives in different dielectric constants within time-dependent DFT (TD-DFT) approaches. Our results quantitatively allow the determination of large Stokes shifts in nonpolar solvents around 100 nm. These theoretical results are in agreement with experimental solvatochromism studies of benzimidazoles. The effect of halogenation, with fluorine, chlorine, and bromine, is less important than solvent polarization when ESIPT takes place. Thus, halogenation can be properly chosen depending on the interest of the synthesis of benzimidazole-based turn-on fluorescence in appropriate solvents.
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