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Excited-state vibrational relaxation and deactivation dynamics of trans-4-(N,N-dimethylamino)-4′-nitrostilbene in nonpolar solvents studied by ultrafast time-resolved broadband fluorescence spectroscopy

Paper ID Volume ID Publish Year Pages File Format Full-Text
26586 43965 2015 7 PDF Available
Title
Excited-state vibrational relaxation and deactivation dynamics of trans-4-(N,N-dimethylamino)-4′-nitrostilbene in nonpolar solvents studied by ultrafast time-resolved broadband fluorescence spectroscopy
Abstract

•Vibrational relaxation of DMANS S1 state proceeds in multiple stages within ∼15 ps.•Oscillatory fluorescence was observed and assigned to a coherent vibrational motion.•Total fluorescence intensity decay agrees with a mixed triplet–single deactivation mechanism.

The excited-state relaxation dynamics of trans-4-(N,N-dimethylamino)-4′-nitrostilbene excited to the first absorption band in nonpolar solvents (cyclohexane and n-hexadecane) has been studied with ultrafast time-resolved broadband fluorescence spectroscopy. The temporal evolution of the time-resolved fluorescence spectra and bandwidth narrowing reveal a multiple-stage vibrational relaxation within ∼15 ps followed by slower excited-state deactivation steps (80 and 950 ps in cyclohexane). In addition, an oscillatory fluorescence with a period of about 1.1 ps was observed and attributed to the coherent vibrational motion of the nitrophenyl/aminophenyl torsion that modulates the early-time fluorescence spectra. The decay of the total fluorescence intensity with cubic frequency correction was found to be consistent with a competitive triplet–single deactivation mechanism.

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Keywords
P-dimethylamino nitrostilbene; Vibrational relaxation and coherence; Ultrafast time-resolved fluorescence spectroscopy
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Excited-state vibrational relaxation and deactivation dynamics of trans-4-(N,N-dimethylamino)-4′-nitrostilbene in nonpolar solvents studied by ultrafast time-resolved broadband fluorescence spectroscopy
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 310, 1 September 2015, Pages 26–32
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
Full-text PDF Download
Online Support
Any Questions? feel free to contact us