کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1411790 | 1501894 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of ring substituents on hydrogen bonding of 5-cyano-2-hydroxyacetophenone and 2-hydroxy-4-methoxy-5-nitroacetophenone in the ground and excited states
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The crystal structures of two ortho-hydroxyacetophenones (5-cyano-2-hydroxyacetophenone and 2-hydroxy-4-methoxy-5-nitroacetophenone) were determined by X-ray diffraction at 100Â K. These experimental values are compared with quantum mechanical DFT calculations (B3LYP/6-311++G(d,p)). DFT calculations have resulted in potential energy surfaces for the ground state (GSPES). The effect of intramolecular interactions, in particular of intramolecular hydrogen bonds, on steady-state fluorescence spectra in non-polar solvents and solid state at room temperature show interesting results. Excited state intramolecular proton transfer (ESIPT) was evidenced by a large Stokes shifted fluorescence (â¼11,000Â cmâ1). Intensive fluorescence was observed in the solid state of 5-cyano-2-hydroxyacetophenone.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volumes 844â845, 12 November 2007, Pages 77-82
Journal: Journal of Molecular Structure - Volumes 844â845, 12 November 2007, Pages 77-82
نویسندگان
A. Filarowski, A. Kochel, P.E. Hansen, A. Urbanowicz, K. Szymborska,