کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9575315 1504345 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spectroscopy and photophysics of flavin related compounds: Riboflavin and iso-(6,7)-riboflavin
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Spectroscopy and photophysics of flavin related compounds: Riboflavin and iso-(6,7)-riboflavin
چکیده انگلیسی
The photochemistry and photophysics of isoalloxazines (10-substituted 2,3,4,10-tetrahydro-benzo[g]pteridine-2,4-diones), and especially flavins (7,8-dimethyl substituted isoalloxazines), are of considerable interest due to the biological relevance of these compounds. In this paper we report data concerning the photophysics of riboflavin and iso-(6,7)-riboflavin (10-(2,3,4,5-tetrahydroxypentyl)-6,7-dimethylbenzo[g]pteridine-2,4(3H,10H)-dione), and correlate the spectroscopic observations with theoretical calculations performed using time-dependent density functional theory. On the basis of these calculations the lowest excited singlet and triplet states are both assigned (π,π*) symmetry, and this result is used to explain the relatively low singlet oxygen quantum yields in comparison with alloxazines. Time-resolved emission studies have indicated 6,7-dimethylalloxazine a photodegradation product of iso-(6,7)-riboflavin.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 314, Issues 1–3, 18 July 2005, Pages 239-247
نویسندگان
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