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Science 9 July 1993:
Vol. 261. no. 5118, pp. 186 - 189
DOI: 10.1126/science.261.5118.186
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Articles

Relation Between Bond-Length Alternation and Second Electronic Hyperpolarizability of Conjugated Organic Molecules

Seth R. Marder 1, Christopher B. Gorman 1, Bruce G. Tiemann 1, Joseph W. Perry 2, Grant Bourhill 2, and Kamjou Mansour 2

1 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 and The Beckman Institute, California Institute of Technology, Pasadena, CA 91125
2 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109

The solvent dependence of the second hyperpolarizability, ggr, of a variety of unsaturated organic compounds has been measured by third harmonic generation at 1907 nanometers. It is seen that the measured ggr is a function of solvent polarity. These solvent-dependent hyperpolarizabilities are associated with changes in molecular geometry from a highly bond-length alternated, polyene-like structure for a formyl-substituted compound in non-polar solvents, to a cyanine-like structure, with little bond-length alternation, for a dicyanovinyl-substituted compound in polar solvents. By tuning bond-length alternation, ggr can be optimized in either a positive or negative sense for polymethine dyes of a given conjugation length.

Submitted on January 29, 1993
Accepted on May 19, 1993


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Electronic Coherence and Nonlinear Susceptibilities of Conjugated Polyenes.
S. Mukamel, A. Takahashi, H. X. Wang, and G. Chen (1994)
Science 266, 250-254
   Abstract »    PDF »
A Unified Description of Linear and Nonlinear Polarization in Organic Polymethine Dyes.
S. R. Marder, C. B. Gorman, F. Meyers, J. W. Perry, G. Bourhill, J.-L. Bredas, and B. M. Pierce (1994)
Science 265, 632-635
   Abstract »    PDF »
Molecular Geometry and Nonlinear Optics.
J. L. Bredas (1994)
Science 263, 487-488
   PDF »
Plastics That Play on Light.
D. Bradley (1993)
Science 261, 1272-1273
   PDF »


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Science. ISSN 0036-8075 (print), 1095-9203 (online)