Synthesis, characterization and third-order non-linear optical properties of novel fluorene monomers and their cross-conjugated polymers |
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Authors: | G Ramos-Ortíz MCG Hernández S Fomine U Scherf E Preis J Cárdenas |
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Affiliation: | a Centro de Investigaciones en Óptica A.C., A.P. 1-948, 37000 León, Gto., Mexico b Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Apartado Postal 70-360, CU, Coyoacán 04510, México D.F., Mexico c Macromolecular Chemistry Group, Wuppertal University, Gauss-Str. 20, D-42097 Wuppertal, Germany d Instituto de Química, Universidad Nacional Autónoma de México, Apartado Postal 70-360, CU, Coyoacan 04510, México D.F., México |
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Abstract: | We designed and synthesized two novel fluorene monomers of D-A-D (donor-acceptor-donor) type (M1 and M2), and their two corresponding polymers (PM1 and PM2) and a copolymer (CPM). These high molecular weight, film-forming polymers were obtained from metal-free, superacid-catalyzed reactions of the monomers with N-phenylisatin. The cubic NLO response (χ(3)) for these new compounds, in solid thin films, was measured through the use of third-harmonic generation (THG) Maker-Fringes technique at IR wavelengths given values of the order of 10−12 esu from which, the corresponding second hyperpolarizabilities (γ) were estimated to be of the order of 10−33 esu for monomers and 10−31 esu for polymers. Second hyperpolarizabilities have also been estimated theoretically at B3LYP/6-31G(d) level of theory in gas phase and related with the electronic structure of the synthesized molecules. |
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Keywords: | Fluorene polymers Cubic NLO response THG Maker-Fringes |
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