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Proceedings Paper

Third-order polarizabilities of symmetric and nonsymmetric polyene and cyanine-like organic molecules
Author(s): Grant Bourhill; Kamjou Mansour; Bruce G. Tiemann; Christopher B. Gorman; Shawnna Biddle; Seth R. Marder; Joseph W. Perry
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Paper Abstract

The second hyperpolarizability, (gamma) , of the donor-acceptor polyene compounds (CH3)2N-(CHequalsCH)3-CHO, 3, (CH3CH2CH2CH2)2N- (CHequalsCH)2-CHequalsC(CN)2, 4, the cyanine compound [CH2CH2OCH2CH2-N-(CHequalsCH)3-CHequalsN-CH2CH2OCH2CH2]+ClO4-, 5, and the linear polyenes CH3- (CHequalsCH)n-CH3, where n equals 4, 1, or 5, 2, have been measured by third harmonic generation (THG) at 1907 nm, in a series of solvents ranging in polarity from CCl4 to CH3OH. It was found that 3, with the moderately strong formyl acceptor, had positive values of (gamma) which exhibit a peak as a function of solvent polarity. In contrast, 4, with the stronger dicyanovinyl acceptor, had positive (gamma) in very nonpolar solvents but increasingly negative (gamma) values in solvents of moderate to high polarity. These solvent- dependent hyperpolarizabilities are associated with a change in geometry from a highly bond length alternated, polyene-like structure for the formyl-substituted compound in nonpolar solvents, to a cyanine-like structure, with very little bond length alternation, for the dicyanovinyl-substituted compound in polar solvents.

Paper Details

Date Published: 27 April 1993
PDF: 13 pages
Proc. SPIE 1853, Organic and Biological Optoelectronics, (27 April 1993); doi: 10.1117/12.144063
Show Author Affiliations
Grant Bourhill, Jet Propulsion Lab. (United States)
Kamjou Mansour, Jet Propulsion Lab. (United States)
Bruce G. Tiemann, Jet Propulsion Lab. (United States)
Christopher B. Gorman, Jet Propulsion Lab. (United States)
Shawnna Biddle, Jet Propulsion Lab. (United States)
Seth R. Marder, Jet Propulsion Lab. and Beckman Institute (United States)
Joseph W. Perry, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 1853:
Organic and Biological Optoelectronics
Peter M. Rentzepis, Editor(s)

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