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Relation between bond-length alternation and second electronic hyperpolarizability of conjugated organic moleculesThe solvent dependence of the second hyperpolarizability, gamma, of a variety of unsaturated organic compounds has been measured by third harmonic generation at 1907 nanometers. It is seen that the measured gamma is a function of solvent polarity. These solvent-dependent hyperpolarizabilities are associated with changes in molecular geometry from a highly bond-length alternated, polyenelike structure for a formyl-substituted compound in nonpolar solvents, to a cyaninelike structure, with little bond-length alternation, for a dicyanovinyl-substituted compound in polar solvents. By tuning bond-length alternation, gamma can be optimized in either a positive or negative sense for polymethine dyes of a given conjugation length.
Document ID
19930065551
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Marder, Seth R.
(JPL; California Inst. of Technology Pasadena, United States)
Perry, Joseph W.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Bourhill, Grant
(JPL Pasadena, CA, United States)
Gorman, Christopher B.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Tiemann, Bruce G.
(JPL; California Inst. of Technology Pasadena, United States)
Mansour, Kamojou
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
July 9, 1993
Publication Information
Publication: Science
Volume: 261
Issue: 5118
ISSN: 0036-8075
Subject Category
Chemistry And Materials (General)
Accession Number
93A49548
Funding Number(s)
CONTRACT_GRANT: F49620-92-J-0177
Distribution Limits
Public
Copyright
Other

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