Theoretical study of phenylene-thiophene oligomers: structure-properties relationship.
Theoretical results including geometrical characteristics, electronic structures, photophysical parameters (lowest excitation energies, electron affinities (EAs), ionization potentials (IPs), maximum of absorption and emission) and vibrational modes of some new oligomers, based on phenylene-thiophene motives, are investigated using Density Functional Theory DFT/B3LYP/6-31G(d) approach. The electronic and optical properties of phenylene-based derivatives can be tuned through the insertion of thiophene in the main oligomers backbone as well as the addition of alkoxy-substituent groups on 2 and 5 positions on phenylene groups. It can be noticed, that different conformational behaviors and steric effects take place. Then, an increase in conjugation length induces a decrease in the gaps energy and a bathochromic shift of absorption/emission spectra. Based on these computed results, which are consistent with the available experimental data, the correlation structure-properties is better understood, where these nanostructures show a great potential for opto-electronic devices.
Université de Monastir, Unité de recherche Matériaux Nouveaux et Dispositifs Electroniques Organiques, Faculté des Sciences de Monastir, 5000 Monastir, Tunisia.
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Hlel
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Mabrouk
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Chemek
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K
Alimi
D001555:Benzene Derivatives / Q000737:chemistry*; D004583:Electrons; D008163:Luminescent Measurements; D008958:Models, Molecular; D008968:Molecular Conformation; D011789:Quantum Theory; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013876:Thiophenes / Q000737:chemistry*
D001555:Benzene Derivatives; D013876:Thiophenes