Synthesis and properties of highly soluble third-order optically nonlinear chromophores and methacrylate monomer based on distyrylbenzene
作者:M. S. Wong、M. Samoc、A. Samoc、B. Luther-davies、M. G. Humphrey
DOI:10.1039/a803229g
日期:——
A novel series of highly soluble distyrylbenzenes bearing poly(alkyleneoxy) and/or alkylsulfonyl solubilizing substituents has been synthesized using the stereoselective Wadsworth–Emmons reaction as a key step. The corresponding poly(alkyleneoxy) alkylsulfonyl 4,4′-disubstituted distyrylbenzene has been covalently incorporated into an acrylic monomer which has also been successfully co-polymerized with methyl methacrylate (MMA). All the 4,4′-disubstituted distyrylbenzenes and the polyacrylate based co-polymer show excellent solubility, processibility and thermal stability. Importantly, 2-(2-butoxyethoxy)ethoxy-hexylsulfonyl 4,4′-disubstituted distyrylbenzene exhibits only a minor bathochromic shift of the absorption maximum compared to those of the corresponding symmetrically 4,4′-disubstituted distyrylbenzenes; however, its third-order optical nonlinearity derived from Z-scan measurements at 800 nm is approximately twice as large as those of its symmetrically 4,4′-disubstituted counterparts.
以立体选择性 Wadsworth-Emmons 反应为关键步骤,合成了一系列新型高溶解性二丙烯苯,这些二丙烯苯带有聚(烷氧基)和/或烷基磺酰基增溶取代基。相应的 4,4′-二取代二丙烯酰基聚(烷氧基)烷基磺酰基已与丙烯酸单体共价结合,并成功地与甲基丙烯酸甲酯(MMA)共聚。所有 4,4′-二取代二丙烯酰苯和基于聚丙烯酸酯的共聚物都表现出优异的溶解性、加工性和热稳定性。重要的是,与相应的对称 4,4′-二取代二丙烯苯相比,2-(2-丁氧基乙氧基)乙氧基-己基磺酰基 4,4′-二取代二丙烯苯的吸收最大值仅有轻微的浴色偏移;然而,在 800 纳米波长处通过 Z 扫描测量得出的三阶光学非线性大约是对称的 4,4′-二取代二丙烯苯的两倍。