کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5375483 | 1504297 | 2009 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Spectra and photophysics of new organic fluorophores: 2,3-Di(phenylethenyl)benzofuran derivatives
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Conformations, spectra and photophysics of a series of new organic fluorophores, 2,3-distyrylbenzofuran derivatives, have been studied by a combined theoretical and experimental approach. Ground electronic state geometries have been investigated by Hartree-Fock ab initio methods and Density Functional Theory. Electronic spectra have been calculated with the CS INDO S-CI and SDT-CI procedures. Spectral and photophysical behaviour has been investigated by stationary and time-resolved techniques. Solvatochromism of these compounds has been analyzed. The UV-vis absorption spectra of the substituted compounds are very similar, showing a red shift in the series H < Cl < OCH3 < NH2 < NO2. The CS INDO CI analysis of the electronic spectra of all rotamers shows coherence with the prevalent presence of one non-planar conformer. These compounds are very stable and show an intense and structured fluorescence indicating that the emitting state is the same as that reached by absorption, i.e. the |ÏHÏLâã singlet state. The nitro-derivative behaviour is exceptional if compared to the other compounds since it displays a strong fluorosolvatochromism, due to an intramolecular charge transfer state.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 361, Issues 1â2, 30 June 2009, Pages 61-67
Journal: Chemical Physics - Volume 361, Issues 1â2, 30 June 2009, Pages 61-67
نویسندگان
Ivan Baraldi, Enrico Benassi, Serena Ciorba, Marija Å indler-Kulyk, Irena Å koriÄ, Anna Spalletti,