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A tricyanofuran (TCF) acceptor-based nonlinear optical (NLO) chromophore (2-(3-cyano-4-(4-((2-hydroxyethyl)(methyl)amino)styryl)-5,5-dimethylfuran-2(5H)-ylidene)malononitrile,abbr. FS) was synthesized and then reacted with 3-isocyarmatopropyl triethoxysilane (ICTES) to form a functionalized silicon alkoxide precursor (named ICTES-FS).Sol solutions were obtained after co-hydrolysis/condensation of ICTES-FS,tetraethoxysilane (TEOS) and 3-(Trimethoxysilyl)propyl methacrylate (TSPM).Transparent films were only fabricated with the sol containing high concentration of TSPM.Higher concentration of TSPM was found useful to abate dipolar chromophore interactions and consequent aggregation problems.Second- order NLO properties and temporal stability of sol-gel films were also investigated by virtue of in situ second harmonic generation (SHG).
A tricyanofuran (TCF) acceptor-based nonlinear optical (NLO) chromophore (5H (2-hydroxyethyl) ) -ylidene) malononitrile, abbr. FS) was synthesized and then reacted with 3-isocyarmatopropyl triethoxysilane (ICTES) to form a functionalized silicon alkoxide precursor (named ICTES- FS). Sol solutions were obtained after co-hydrolysis / condensation of ICTES- FS, tetraethoxysilane (TEOS) and 3- (Trimethoxysilyl) propyl methacrylate (TSPM) .Transparent films were fabricated only with the sol containing high concentration of TSPM. Hgher concentration of TSPM was found useful to abate dipolar chromophore interactions and consequent aggregation problems. Second - order NLO properties and temporal stability of sol-gel films were also investigated by virtue of in situ second harmonic generation (SHG).