کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
28298 44068 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photophysical properties, excitation energy transfer and laser activity of 3-(4′-dimethylaminophenyl)-1-(2-pyridinyl) prop-2-en-1-one (DMAPP): A new potential laser dye
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Photophysical properties, excitation energy transfer and laser activity of 3-(4′-dimethylaminophenyl)-1-(2-pyridinyl) prop-2-en-1-one (DMAPP): A new potential laser dye
چکیده انگلیسی

The photophysical properties such as singlet absorption, molar absorptivity, fluorescence spectra, fluorescence quantum yield (ϕf) and transition dipole moment (μ12) of 3-(4′-dimethylaminophenyl)-1-(2-pyridinyl) prop-2-en-1-one (DMAPP) were measured in different media. DMAPP dye exhibits a large red shift in both absorption and emission spectra as solvent polarity increases, indicating a large change in dipole moment of molecule upon excitation. Also, the fluorescence quantum yield is solvent dependent. A crystalline solid of DMAPP gives excimer like emission at 585 nm. Dye solution ca 1 × 10−3 mol dm−3 in CHCl3 gives a good laser emission in the range 440–600 nm with emission maximum at 550 nm upon pumping by nitrogen laser (λex = 337.1 nm). The excitation energy transfer from 7-dimethylamino-4-methyl coumarine (DMC) to DMAPP has also been studied in CHCl3 and the value of energy transfer and critical transfer distance indicate a Főrster-type mechanism. The photochemical quantum yields (ϕc) of DMAPP in chloromethane solvents are also determined.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 195, Issue 1, 5 March 2008, Pages 89–98
نویسندگان
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