【摘要】 合成了4个以噻唑环为母体、含有Schiff碱结构的新型二阶非线性光学(NLO)活性分子,用红外光谱、紫外光谱、核磁共振光谱和元素分析确定了分子结构,用溶致变色法确定了二阶极化率。分子中噻唑五元杂环和Schiff碱结构提高了NLO分子的热稳定性和透明性,噻唑的共轭芳香杂环非中心对称结构连接多个供、吸电子基团,提高了分子的二阶非线性系数。结果表明,这些NLO分子的紫外吸收波长在350~415nm之间,裂解温度均在300℃左右,二阶非线性光学系数β值达到1×10-30esu数量级,初步实现了"二阶非线性-透明性-热稳定性"综合性能优化的目标。更多还原

【Abstract】 Four new second-order nonlinear optical(NLO) molecules derivated from thiazole and containing the structure of Schiff base were synthesized. These target molecules were confirmed by IR, UV, NMR and elemental analysis, and 2nd-order polarizability of those molecules were determined by a solvatochromic method. The structure of a five-membered heterocyclic ring and Schiff base improved the thermally stability and transparency, and the nonsymmetric conformation of thiazloe could link many donors and acceptors and thus improves the β value. Experimental results show that the maximum absorption wavelength was 350~415 nm, the decomposition temperature was about 300 ℃, and the β value was 1×10-30 esu, indicating a good nonlinearity-transparency-thermally stable comprehensive optimization has been achieved.更多还原