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TitleSecond-order nonlinear optical properties of zwitterionic chromophores
Publication TypeConference Paper
Year of Publication2010
AuthorsTeshome, A., Asselberghs I., Clarke D.J., Middleton A.P., Bhuiyan M.D.H., Smith G.J., Kay A.J., and Clays K.
Conference NameProceedings of SPIE - The International Society for Optical Engineering
Date Published2010
KeywordsChromophores, Dimethylformamide, Hyper Rayleigh scattering, merocyanine, Molecular hyperpolarizabilities, Molecules, Nonlinear optics, Optical materials, Optical properties, Organic solvents, Rayleigh scattering, Second order nonlinear optics, Solvent polarity
AbstractThe molecular linear and second-order nonlinear optical (NLO) properties of a series of donor (D)-π-acceptor (A) merocyanine molecules have been studied in three solvents, dimethylformamide (DMF), tetrahydrofuran (THF), and chloroform (CHCl3). All the compounds have a cyanodicyanomethylidenedihydrofuran electron acceptor system with either a pyridinylidene or quinolinylidene donor group. In high polarity solvents the molecules with a quinolinylidene donor have larger first hyperpolarizabilities than those with a pyridinylidene donor, while the opposite is true in low polarity solvents. The molecules under investigation have an aromatizable donor unit, which leads to a high degree of charge separation in the ground-state; as a result they have a strong tendency to aggregate. To minimize these interactions arene-rich bulky groups have been introduced in a number of these compounds. © 2010 SPIE.

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