18 May 2010 Second-order nonlinear optical properties of zwitterionic chromophores
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The 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.
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Ayele Teshome, Inge Asselberghs, David J. Clarke, Ayla P. Middleton, M. Delower H. Bhuiyan, Gerald J. Smith, Andrew J. Kay, Koen Clays, "Second-order nonlinear optical properties of zwitterionic chromophores", Proc. SPIE 7722, Organic Photonics IV, 772228 (18 May 2010); doi: 10.1117/12.854664; https://doi.org/10.1117/12.854664

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