کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5377181 | 1504336 | 2006 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Solvent effects on electronic transitions of fluorenone and 4-hydroxyfluorenone
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
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چکیده انگلیسی
The solvation characteristics of the ground and excited states of fluorenone and 4-hydroxyfluorenone were investigated in neat and binary solvent mixtures. The spectral shifts are correlated by the Kamlet-Taft parameters (Ï*, β, and α). Multiple linear regression analysis indicates that both non-specific dipolar interaction and specific hydrogen-bonding interaction play an important role in the position of the absorption and fluorescence maxima in neat solvents. The behavior of the fluorenone and 4-hydroxyfluorenone in methylcyclohexane-tetrahydrofuran and methylcyclohexane-ethanol solvent mixtures has been explained in terms of preferential solvation. Index of preferential solvation has been calculated as a function of solvent composition. These results along with our previous studies [M. Józefowicz, J.R. Heldt, Chem. Phys. 294 (2003) 105] indicate that strong non-linear dependence of the solvatochromic shifts on the mole fraction of ethanol in methylcyclohexane-ethanol mixtures for molecules under study is attributed to formation of hydrogen-bond between solute and solvent in addition to preferential solvation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 323, Issues 2â3, 21 April 2006, Pages 617-621
Journal: Chemical Physics - Volume 323, Issues 2â3, 21 April 2006, Pages 617-621
نویسندگان
M. Józefowicz, J.R. Heldt, J. Heldt,