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• W2316177736 endingPage "14714" @default.
• W2316177736 startingPage "14708" @default.
• W2316177736 abstract "This paper investigates the effect of solvent-induced conformational changes of poly(3,6-phenanthrene) on their two-photon absorption (2PA). Such effect was studied employing the wavelength-tunable femtosecond Z-scan technique and modeled using the sum-over-essential states approach. We observed a strong reduction of the 2PA cross-section when the sample was prepared in hexane (poor solvent) in comparison to chloroform (good solvent), which is related to the conformation adopted by the polymer in each case. In chloroform it adopts a random coil conformation, as opposed to the one-handed helix conformation in hexane. Our results pointed out that the coil to helix conformation change decreases the degree of molecular planarity of the polymer π-conjugated backbone, which is primarily responsible for their optical nonlinearity, contributing to diminishing the effective transition dipole moments and, consequently, the 2PA cross-section. Moreover, by studying the nonlinear response with different light polarization, we showed that, although the solvent-induced conformational change does not alter the molecular symmetry of the polymer, it modifies considerably the direction of the transition dipole moments between the excited states." @default.
• W2316177736 created "2016-06-24" @default.
• W2316177736 creator A5024209261 @default.
• W2316177736 creator A5074129285 @default.
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• W2316177736 date "2012-12-06" @default.
• W2316177736 modified "2023-09-27" @default.
• W2316177736 title "Effect of Solvent-Induced Coil to Helix Conformational Change on the Two-Photon Absorption Spectrum of Poly(3,6-phenanthrene)" @default.
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• W2316177736 doi "https://doi.org/10.1021/jp308161x" @default.
• W2316177736 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23176606" @default.
• W2316177736 hasPublicationYear "2012" @default.
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