摘要
Abstract
A new nonlinear optical A⁃π⁃D⁃π⁃A type chromophore with a carbazyl donor was designed and synthe⁃sized to balance the nonlinearity-transparency trade⁃off by Molecular Engineering Theory (MET) and Crystal Engi⁃neering Theory (CET). The chromophore was characterized by IR, 1 H NMR, 13 C NMR, MS and element analysis. The second⁃order polarizability of the chromophore was detected by a solvatochromic method based on two⁃level models, and the detection process was expounded in detail. The results show that the chromophore had a large sec⁃ond⁃order polarizability, averaging about 519×10-30 cm5 ·esu⁃1and exhibited good transparency. The largest absorp⁃tion wavelength was within 446~452 nm. The coordination of nonlinearity⁃transparency trade⁃off depends on the comprehensive molecular optimization design ideas, including conjugation length, the choice of electron acceptors, electron donors and the design of the two⁃dimensional charge transfer structure, etc.关键词
非线性光学性质/生色分子/二阶极化率/溶致变色法Key words
nonlinear optical property/chromophore/second-order polarizability/solvatochromism分类
化学化工
