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为了研究辅助给体对生色团分子热分解温度以及二阶极化率的影响,以已报道生色团分子2-二氰亚甲基-3-氰基-4-(4-二乙胺基-苯乙烯基)-5,5-二甲基-2,5-二氢呋喃(DCDHF-2-V)为基础,分别在苯环二乙胺基的邻位上以羟基、丁氧基和苄氧基作为辅助给体合成了三种新型的生色团分子:EFC-OH,EFC-OBu和EFC-OBe.通过核磁共振、红外光谱以及元素分析表征确认了其结构.热失重分析结果表明,三种分子的热性能良好,其中EFC-OBe的热分解温度(Td)最高为278.6℃.溶致变色法测定结果表明,EFC-OBe的二阶非线性光学系数(μgβ1064 nm)最高,为47149×10-48 esu.将这三种分子的Td值和μgβ值与未加入辅助给体的DCDHF-2-V分子进行对比,结果表明辅助给体的加入对分子的热稳定性能影响不大,但能显著提高分子的μgβ值一个数量级以上.
In order to study the influence of auxiliary donor on the thermal decomposition temperature and the second-order polarizability of chromophore, we have reported that chromophore molecules such as 2-dicyanomethylene-3-cyano-4- Styryl) -5,5-dimethyl-2,5-dihydrofuran (DCDHF-2-V), respectively, in the ortho position of the benzene ring diethylamino group with hydroxyl, butoxy Three new chromophore molecules, EFC-OH, EFC-OBu, and EFC-OBe, were synthesized with benzyloxy as an auxiliary donor. Their structures were confirmed by NMR, FTIR and elemental analysis. The thermal decomposition temperature (Td) of EFC-OBe was 278.6 ℃ .The results of lytic method showed that the second order nonlinear optical coefficient (μgβ1064 nm) of EFC-OBe was the highest, Is 47149 × 10-48 esu.Comparing the Td values and μgβ values of these three molecules with DCDHF-2-V molecules without added auxiliary donor showed that the addition of auxiliary donor had no effect on the thermal stability of the molecule Large, but can significantly improve the molecular μgβ value of more than an order of magnitude.