11 October 1999 Multilayer X(2) films from porphyrin chromophores by LBK processing
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Electrooptic films based on a new class of porphyrin chromophores with exceptionally large molecular first hyperpolarizabilities are begin developed. These chromophores feature donor and acceptor groups linked to the porphyrin macrocycle at the 5- and 15-meso positions through intervening ethynyl moieties. We report herein preliminary result that describe the ambient temperature assembly of ordered, electrooptic films using the Langmuir-Blodgett-Kuhn method. The facile formation of such films was mae possible by the preparation of amphiphilic chromophores containing hydrophobic aliphatic substituents to enhance the polar alignment at the air-water interface. Second harmonic generation and UV-Vis absorption were used to characterize the films as a function of the number of layers deposited. Polar films containing up to 10 layers were made by simple Y-type homolayer deposition, and up to six layers by the Y- type heterolayer method in which the porphyrin layers were interleaved with poly(t-butyl methacrylate). The polar order in these films relaxed exponentially. Ionic structures are recommended for improved stability.
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Geoffrey A. Lindsay, Geoffrey A. Lindsay, Randall R. Kolega, Randall R. Kolega, M. Joseph Roberts, M. Joseph Roberts, Harry Tetsuo Uyeda, Harry Tetsuo Uyeda, Michael J. Therien, Michael J. Therien, Warren N. Herman, Warren N. Herman, } "Multilayer X(2) films from porphyrin chromophores by LBK processing", Proc. SPIE 3796, Organic Nonlinear Optical Materials, (11 October 1999); doi: 10.1117/12.368288; https://doi.org/10.1117/12.368288

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