کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1237266 968887 2009 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Solvatochromic behavior on the absorption and fluorescence spectra of Rose Bengal dye in various solvents
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Solvatochromic behavior on the absorption and fluorescence spectra of Rose Bengal dye in various solvents
چکیده انگلیسی

The absorption and fluorescence spectra of Rose Bengal dye were studied in various solvents. It was found that solvent effects on the absorption wavelength are consistent with the solvatochromic model of Kamlet, Abboud and Taft. The solvent polarizability value π  * was found to have a linear relationship with the absorption wavelength of the dye in various solvents. Additionally, the normalized transition energy value (ETN) showed some scattering when plotted versus Δνaf. Density functional calculations were used to assign the absorption in the region 540–570 nm to a π–π* transition between the HOMO and LUMO of the anion. Experimental ground state and excited state dipole moments were calculated by using the solvatochromatic shifts of absorption and fluorescence spectra as a function of the dielectric constant (ɛ) and refractive index (n). The dipole moment for Rose Bengal was found to be 1.72 Debye in the ground state, whereas this value was 2.33 Debye in the excited state.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 72, Issue 1, February 2009, Pages 133–137
نویسندگان
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