NDLI: Excitation Wavelength Dependence of Dual Fluorescence of DMABN in Polar Solvents

Content Provider	Springer Nature Link
Author	Atsbeha, Tesfay Mohammed, Ahmed M. Redi Abshiro, Mesfin
Copyright Year	2010
Abstract	Steady-state absorption, fluorescence excitation and emission spectra of 4-(N,N-dimethylamino)benzonitrile (DMABN) have been measured at room temperature in cyclohexane, 1,4-dioxane, dichloromethane, and acetonitrile solutions. The fluorescence spectra of DMABN are found to exhibit dual emission in 1,4-dioxane, dichloromethane, and acetonitrile solutions and single emission in cyclohexane solution. The effect of solvent polarity and excitation wavelength on the emission spectra has also been studied. The fluorescence excitation spectra of DMABN monitored at the emission bands are different. The presence of two different conformations of the same molecule in the ground state has lead to two close lying excited states; local excited (LE) and charge transfer (CT), and thereby results in the dual fluorescence of the compound. The experimental studies were supported by ab initio density functional theory (DFT) calculations performed at the B3LYP/6-31Gd level of theory. On the basis of the experimental results and our theoretical calculations, we suggest that there are two conformers of DMABN, which are stable in the ground state, equilibrated in solution at room temperature that give rise dual fluorescence upon excitation.
Starting Page	1241
Ending Page	1248
Page Count	8
File Format	PDF
ISSN	10530509
Journal	Journal of Fluorescence
Volume Number	20
Issue Number	6
e-ISSN	15734994
Language	English
Publisher	Springer US
Publisher Date	2010-05-16
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dual fluorescence DMABN Solvent effects Excitation wavelength dependency Analytical Chemistry Biochemistry Biotechnology Biophysics and Biological Physics Biomedicine general
Content Type	Text
Resource Type	Article
Subject	Sociology and Political Science Spectroscopy Law Biochemistry Clinical Biochemistry Clinical Psychology

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