15 January 1990 Conformationally Restricted Polymers And Oligomers For Second Order Nonlinear Optics: Dielectric And Solid State Characterization
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The fabrication of second order nonlinear optical materials requires the imposition of noncentrosymmetry on the active moieties in the materials. One of the leading methodologies for inducing noncentrosymmetric alignment of dipolar chromophores used in second order electro-optic materials is to pole them in polymer films. The relationship between the supramolecular conformational structure of assembled chromophores and their susceptibility to poling is of interest for maximizing the bulk alignment achievable in an electro-optic material. We have employed solution phase dielectric constant measurements to investigate possible enhancements in dipolar susceptibility as a function of connectivity and state of aggregation in rationally synthesized chromophore assemblies, including conformationally defined head-to-tail oligomers. Angles of dipole moment vectors determined in solution are in agreement with predictions based on x-ray structures of model compounds. We have also determined that conformationally unrestricted, highly dipolar azo dyes behave as relatively isolated molecules even when present in supersaturated solutions and in close proximity on polymer chains. Representative synthetic methodology and dielectric data will be presented.
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H. E. Katz, H. E. Katz, M. L. Schilling, M. L. Schilling, } "Conformationally Restricted Polymers And Oligomers For Second Order Nonlinear Optics: Dielectric And Solid State Characterization", Proc. SPIE 1147, Nonlinear Optical Properties of Organic Materials II, (15 January 1990); doi: 10.1117/12.962111; https://doi.org/10.1117/12.962111

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