Second-order nonlinear optical properties of new organic conjugated molecules was written by Kawabe, Y.;Ikeda, H.;Sakai, T.;Kawasaki, K.. And the article was included in Journal of Materials Chemistry in 1992.Computed Properties of C18H10N2 This article mentions the following:
Both real and imaginary parts of the second-order nonlinear optical coefficients for a wide range of new organic conjugated materials were measured. The technique of elec.-field-induced second-harmonic generation to determine the optical nonlinearity is described for materials highly absorptive at the harmonic wavelength. The authors evaluated the mol. nonlinear optical coefficients of nitro compounds and aldehydes, barbituric acid derivatives, fulvene derivatives, chalcone derivatives, retinal derivatives, Schiff base compounds, and fused-ring mols., at 1.064 μm. Among these materials, nitro mols. and Schiff base compounds had large optical nonlinearities and good transparency at visible wavelengths. Barbituric acid derivatives and retinal derivatives also had large nonlinearities, but displayed strong absorption of the harmonics. A large enhancement of nonlinearities was achieved in fulvene derivatives by extending the conjugated chains. S atoms, non-benzoic conjugated systems, and fused rings contributed to nonlinear optical effects. Several mols. had very large second-order optical nonlinearities; the products of the mol. nonlinearities and permanent dipole moments μ0β of these were of the order of 10-45-10-44 esu. The relations between mol. nonlinearity and absorption peak energy are discussed. In the experiment, the researchers used many compounds, for example, 2-(Anthracen-9-ylmethylene)malononitrile (cas: 55490-87-4Computed Properties of C18H10N2).
2-(Anthracen-9-ylmethylene)malononitrile (cas: 55490-87-4) belongs to nitriles. Nitrile function is a very important functional group because it can be manipulated to other functional groups such as carboxylic acid by hydrolysis or amine by reduction, respectively. In addition, Nitriles can react with alkynes, which leads to an increase in carbon chain length (carbocyanation).Computed Properties of C18H10N2
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts