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- W2021680609 abstract "The second hyperpolarizability, (gamma) , of the donor-acceptor polyene compounds (CH<SUB>3</SUB>)<SUB>2</SUB>N-(CHequalsCH)<SUB>3</SUB>-CHO, 3, (CH<SUB>3</SUB>CH<SUB>2</SUB>CH<SUB>2</SUB>CH<SUB>2</SUB>)<SUB>2</SUB>N- (CHequalsCH)<SUB>2</SUB>-CHequalsC(CN)<SUB>2</SUB>, 4, the cyanine compound [CH<SUB>2</SUB>CH<SUB>2</SUB>OCH<SUB>2</SUB>CH<SUB>2</SUB>-N-(CHequalsCH)<SUB>3</SUB>-CHequalsN-CH<SUB>2</SUB>CH<SUB>2</SUB>OCH<SUB>2</SUB>CH<SUB>2</SUB>]<SUP>+</SUP>ClO<SUB>4</SUB><SUP>-</SUP>, 5, and the linear polyenes CH<SUB>3</SUB>- (CHequalsCH)<SUB>n</SUB>-CH<SUB>3</SUB>, 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 CCl<SUB>4</SUB> to CH<SUB>3</SUB>OH. 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." @default.
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- W2021680609 date "1993-04-27" @default.
- W2021680609 modified "2023-10-01" @default.
- W2021680609 title "Third-order polarizabilities of symmetric and nonsymmetric polyene and cyanine-like organic molecules" @default.
- W2021680609 doi "https://doi.org/10.1117/12.144063" @default.
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