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1 December 1991 Relationship between conjugation length and third-order nonlinearity in bis-donor substituted diphenyl polyenes
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Abstract
In the design of new organic materials with enhanced nonlinear optical activity, it has been predicted that (gamma) , the third order hyperpolarizability (second hyperpolarizability) will not increase indefinitely in a regular fashion as the conjugation length increases. In regular polyenes, for example, (gamma) has been predicted to level off after circa 10 - 15 repeat units. However, very few experimental systems have been investigated in which the number of repeat units approach these limits. Synthetic difficulties and the lack of solubility of longer oligomers has precluded accurate measures of (gamma) in polyenylic series of well- characterized compounds. In the present study, we discuss how long, and branched-chain alkyl groups attached via alkoxy-substituted phenyl rings can greatly increase the solubility of long polyene oligomers for D,D- and D,A- substituent patterns. This allows, for the first time, a comprehensive study of how (gamma) varies with conjugation length and symmetrical versus asymmetrical substitution.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Charles W. Spangler, Kathleen O. Havelka, Mark W. Becker, Tracy Ann Kelleher, and Lap-Tak A. Cheng "Relationship between conjugation length and third-order nonlinearity in bis-donor substituted diphenyl polyenes", Proc. SPIE 1560, Nonlinear Optical Properties of Organic Materials IV, (1 December 1991); https://doi.org/10.1117/12.50713
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