Study On The Synthesis And Properties Of Third-order Nonlinear Optical Organic Materials

Nonlinear optical materials are the important material foundation of the development of opto-eletronic technology. Third-order nonlinear optical organic materials are of current interest of scientific research. The synthesis of polyheterocyclic materials and theirintermediates have been studied. The third-order susceptibility x^ ç™´ tne materials and the hyperpolarizability 7 of the molecuses have been measured. The influence of structure of molecules upon the third-order nonlinear optical properties is studied.Benzodifuranone and there its derivative materials were synthesized via the reaction of hydroquinone with (un)substituted mandelic acids. The reaction mechanism was proposed.Dibenzo[b,i]thianthrene-5,7,12,14-tetrone was synthesized starting from the reaction of 2,3-dichloro-l,4-naphthoquinone with sodium sulphide. Dinaphttho[2,3-b:2',3'-d]thiophene-5,7,12,14-tetrone was synthesized by the oxidation of dibenzo[b,i]thianthrene-5,7,12,14-tetrone. The reduction and methylation of dibenzo[b,i]thianthrene-5,7,12,14-tetrone gave 5,7,12,14-tetramethoxydibenzo[b,i]thianthrene.Four pyridone monoazo materials were synthesized by the reaction of pyridone with azimide.The third-order nonlinear optical properties of the materials synthesized were measured by Fore-wave Mixing Technique in Laboratory for Quantum Optics of East China Normal University. The results showed that dibenzo[b,i]thianthrene-5,7,12,14-tetrone and pyridone monoazo compounds display high value of third-order susceptibility. They are potential functional materials for opto-electronic devices.