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Photophysical properties of an environment sensitive fluorophore 1-keto-6,7-dimethoxy-1,2,3,4-tetrahydrocarbazole and its excited state interaction with N,N-dimethylaniline: A spectroscopic investigation

Paper ID Volume ID Publish Year Pages File Format Full-Text
27069 43998 2012 9 PDF Available
Title
Photophysical properties of an environment sensitive fluorophore 1-keto-6,7-dimethoxy-1,2,3,4-tetrahydrocarbazole and its excited state interaction with N,N-dimethylaniline: A spectroscopic investigation
Abstract

Photophysical properties of a fluorophore 1-keto-6,7-dimethoxy-1,2,3,4-tetrahydrocarbazole (KTHC-67) have been studied in a number of organic solvents. The profile of the fluorescence spectrum and the wavelength at which fluorescence intensity maximizes are found to vary with the nature of the solvent. The photophysics of KTHC-67 is much more influenced by the hydrogen bond donor and acceptor abilities of the solvents rather than their polarity of the solvent. Excited state interactions of KTHC-67 with N,N-dimethylaniline (DMA) have also been investigated in three homogeneous solvents, acetonitrile (ACN), dimethyl sulphoxide (DMSO) and ethanol (EtOH). Photoinduced electron transfer from DMA to KTHC-67 is evident from the subsequent changes in the fluorescence intensity, fluorescence lifetime and transient absorbance of KTHC-67 in presence of DMA.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Excited state dipole moment of KTHC-67 is 3.197 D higher than that in ground state. ► Fluorescence maximum of KTHC-67 is red-shifted by 71 nm from 1,4-dioxane to EtOH. ► Fluorescence maximum of KTHC-67 is red-shifted by 47 nm from DMSO to MeOH. ► Photophysics of KTHC-67 is mostly controlled by H-bond donor ability of solvent. ► Photoinduced electron transfer is liable for the interaction of KTHC-67 with DMA.

Keywords
Quantum yield; Solvatochromism; Intramolecular charge transfer; Ground and excited state dipole moment; Empirical polarity parameters; Protic solvent sensitivity; Laser flash photolysis; Photoinduced electron transfer
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Photophysical properties of an environment sensitive fluorophore 1-keto-6,7-dimethoxy-1,2,3,4-tetrahydrocarbazole and its excited state interaction with N,N-dimethylaniline: A spectroscopic investigation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 240, 15 July 2012, Pages 66–74
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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