The dependence of the molecular first hyperpolarizabilities of merocyanines on ground-state polarization and length

Abstract

We report here the dipole moment (µ) and first hyperpolarizability (β) determined by electric field-induced second harmonic generation, for several merocyanine dyes containing an 1,3,3-trimethylindoline heterocycle as a 'donor' in which the 'acceptor' end of the molecule and the polyene bridge length was systematically varied; dyes with hexamethine bridges gave positive β, while that with a dimethine bridge gave a negative β value.

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© 1994 Royal Society of Chemistry. Received, 23rd June 1994; Com. 4/03810J. The work was performed in part by the Jet Propulsion Laboratory, California Institute of Technology, as part of its Center for Space Microelectronics Technology and was supported by the Ballistic Missiles Defense Initiative Organization, Innovative Science and Technology Office, through a contract with the National Aeronautics and Space Administration (NASA). Support at the Beckman Institute from the National Science Foundation (grant No. CHE-9 106689) and the Air Force Office of Scientific Research (grant No. 49620-93-1-0314) is gratefully acknowledged.

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