Abstract: Organic second-order nonlinear optical(NLO) materials have been intensively studied over the past two decades for their potential applications in photonic and electro-optic devices.  In order to exhibit second-order NLO properties, these materials must have push-pull structrue containing both electron-acceptor and electron-donor groups connected by an electron-transmitting bridge.  In this paper, two novel organic NLO chromophores MFNC and EFNC were designed with tricyanofuran as electron acceptors, azobenzene as conjugate bridges and electron donors were dimethylamin and diethylamin. They were synthesized by azo coupling reaction and aldol condensation reaction, and were characterized by FTIR, 1H NMR and elemental analysis, respectively. TGA and DSC results revealed that the Td of EFNC was up to 266  ℃ and lightly better than MFNC.  By measuring the UV-Vis spectra of two materials in chloroform, acetone, DMSO separately, we got the μgβ value of EFNC with solvatochromism method led to as large as 59706×10-48 esu at 1064 nm.  Both thermal and NLO properties indicate that they have great potential in application of highly integrated optical devices.

Key words: Azobenzene, Non-linear optics, Chromophore