کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7839915 1505862 2018 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A two-channel mechanism for the asymmetric excited-state intramolecular double proton transfer in a hydroxyflavone derivative
ترجمه فارسی عنوان
مکانیسم دو کانال برای انتقال پروتئین دو طرفه مولکولی متقارن نامتقارن در یک مشتق از هیدروکسی فلاوون
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی
The excited-state proton transfer (ESPT) mechanism of 3,7-dihydroxy-2-phenyl-6-acetyl-4H-chromen-4-one (DPACO) fluorophore was studied by the density functional theory (DFT) and time-dependent density functional theory (TD-DFT) with CAM-B3LYP functional and 6-31 +G(d,p) basis set. The computation levels are reliable as evidenced by the accordance between theory and experiment. In the ground state of DPACO, two intramolecular hydrogen bonds were formed. After photo-excitation, the electron density redistributions provide the driving force for hydrogen-bonding strengthening and ESPT. The constructed potential energy surfaces (PESs) along proton transfer (PT) coordinates indicate that two PT channels exist in the excited state. Among various PT tautomers, T4*is theoretically assigned as the main fluorescence emitter, while the low fluorescence quantum yield possibly correlate with the accelerated internal conversion pathway in the PT tautomer T6*.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 200, August 2018, Pages 14-18
نویسندگان
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