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27 August 2014 Investigations of molecular nonlinear optical polarizabilities of azobenzenes substituted with strong acceptor groups
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Abstract
In this paper, a detailed optical characterization of a series of 4-nitro/cyan, 2-nitro/cyan and 2,4-nitro/cyan substituted azobenzenes is carried out. The first-order hyperpolarizabilities of organic chromophores were determined by solvatochromic method. Different nonlinear optical behaviour is evidenced when the ortho position of an azo molecule is occupied by acceptor and donor substituents. An increase of first-order hyperpolarizability was noticed in the case of 2,4-disubstituted azobenzenes as compared to the monosubstituted ones. Solvent effect on the UV-Vis absorption spectra of azo-polymers was investigated using Kamlet-Taft multiparameter equation. Kamlet-Taft equation revealed that hydrogen bond acceptor properties and dipolarity/polarizability of the solvent have a significant contribution upon the solvatochromic behavior of azo-derivatives.
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Valentin Victor Jerca, Florica Adriana Jerca, Ileana Rau, Francois Kajzar, Dan Sorin Vasilescu, and Dumitru Mircea Vuluga "Investigations of molecular nonlinear optical polarizabilities of azobenzenes substituted with strong acceptor groups", Proc. SPIE 9171, Nanobiosystems: Processing, Characterization, and Applications VII, 91710Z (27 August 2014); https://doi.org/10.1117/12.2073075
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