The photophysics and two-photon absorption of a series of quadrupolar and tribranched molecules: The role of the edge substituent |
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| Authors: | M Fakis I Fitilis S Stefanatos P Vellis J Mikroyannidis V Giannetas P Persephonis |
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| Affiliation: | 1. Department of Physics, University of Patras, Patras 26504, Greece;2. Department of Chemistry, University of Patras, Patras 26504, Greece;1. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, 2 Linggong Road, Dalian 116024, PR China;2. State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China;1. School of Chemistry and Chemical Engineering, University of Jinan, 250022 Jinan, China;2. State Key Laboratory of Crystal Materials, Shandong University, 250100 Jinan, China;1. Department of Organic Chemistry, Faculty of Chemistry, University of ?ód?, Tamka 12, 91-403 ?ód?, Poland;2. University of Warsaw, Biological and Chemical Research Center, ?wirki i Wigury 101, 02-089 Warszawa, Poland;1. Department of Physical Electronics, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, V Hole?ovi?kách 2, 18000 Prague 8, Czechia;2. Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 95, 53210 Pardubice, Czechia;3. Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Albertov 6, 128 43 Praha 2, Czechia |
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| Abstract: | A series of quadrupolar and tribranched molecules were synthesized in order to examine the role of the edge substituents on their photophysical and two-photon absorption properties. Two-photon absorption cross sections, δ, of the molecules were determined in THF solution using a two-photon excited fluorescence technique with femtosecond pulsed excitation. The quadrupolar molecules contained a fluorene or alcoxy-substituted phenylene central core together with various electron accepting edge substituents such as pyridine, terpyridine, phthalimide and naphthalimide. The tribranched molecules contained triphenylamine at the center and terpyridine or phthalimide substituents at the periphery. It was found that edge phthalimide substituent favour high δ values. δ Values as high as 1660 GM and 1500 GM were obtained from the phthalimide-fluorene-phthalimide and phthalimide-phenylene-phthalimide molecules, respectively; in the case of the tribranched molecule with a phthalimide substituent, a δ-value of 1200 GM was found. |
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