SYNTHESIS AND INVESTIGATION OF THE NONLINEAR-OPTICAL PROPERTIES OF VARIOUS P-AMINOPHENYL SULFONE OLIGOMERS

A series of p-aminophenyl sulfone oligomers (monomers, dimers, and trimers) was synthesized with the purpose of studying the effect of several consecutive dipolar units on their second-order nonlinear optical (NLO) characteristics. Three classes of oligomers were synthesized, namely with a hexamethylene, dimethylene, or piperidine spacer. The dipole moments of these oligomers and the mubeta(z) value, as measured by EFISH (electric field induced second harmonic generation), are reported. The results show that these compounds, despite their head-to-tail arrangement, lack the structural features needed to display enhancement of the hyperpolarizability.