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Excited-state energy levels and photophysics of a short polyene 2-(4-phenyl-1,3-butadien-1-yl)thiophene

Paper ID Volume ID Publish Year Pages File Format Full-Text
26053 43932 2016 7 PDF Available
Title
Excited-state energy levels and photophysics of a short polyene 2-(4-phenyl-1,3-butadien-1-yl)thiophene
Abstract

•Emission spectra of 2-(4-phenyl-1,3-butadien-1-yl)thiophene (PBT) were measured under different conditions.•The existence of a forbidden singlet excited state at energies below the strongly absorbing state is indicated.•The emission of PBT consists of dual fluorescence from S2 and S1 in low polarizable solvents.•The emission of PBT consists mostly of the S1 florescence in the vapor phase.•Analysis of the temperature dependence of the fluorescence provided the excited-state energies and various parameters.

Emission, excitation and absorption spectra of a new and short polyene, 2-(4-phenyl-1,3-butadien-1-yl)thiophene (PBT), have been measured under different conditions by varying temperature and solvent and in the vapor phase, along with those of 2-(2-phenylethenyl)-thiophene (PET). The presence of a forbidden excited singlet state, located at energies slightly below the strongly absorbing state, is indicated for PBT, although the forbidden state was not identified for PET. The emission of PBT consists of fluorescence from the allowed S2 and forbidden S1 states in low polarizable solvents, while it consists of florescence mainly from forbidden S1 in the vapor phase and that from allowed S1 state in high polarizable solvents. Quantitative analysis of the temperature dependence of the S1 and S2 fluorescence spectra provides the S1 and S2 state energies and physical parameters that characterize the excited states of PBT.

Keywords
Short polyene; 2-(4-Phenyl-1,3-butadien-1-yl)thiophene; 2-(2-Phenylethenyl)-thiophene; S2 fluorescence; Forbidden S1 state
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Excited-state energy levels and photophysics of a short polyene 2-(4-phenyl-1,3-butadien-1-yl)thiophene
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 324, 30 June 2016, Pages 40–46
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