Gelation Ability of Novel Oxamide-Based Derivatives Bearing a Stilbene as a Photo-Responsive Unit
作者:Snežana Miljanić、Leo Frkanec、Zlatko Meić、Mladen Žinić
DOI:10.1002/ejoc.200500535
日期:2006.3
various organic solvents. In contrast, cis-3a shows a poor gelation ability or none at all, owing to its good solubility. Considering the difference in gelation abilities of the compounds trans-3a and cis-3a and the photo-responsive conformational changes of the stilbene part of the molecule, a controlled gelation by light was achieved. FT-IR and 1H NMR spectroscopic measurements support the view that hydrogen
已经合成了包含一个或两个与顺式和反式二苯乙烯的 4- 或 4,4'- 位偶联的草酰胺部分的草酰胺衍生物。为了调节溶剂的凝胶化趋势,由它们制备了一系列具有修饰末端官能团的衍生物。发现基于反式茋二草酰胺的衍生物微溶于或不溶于水和有机溶剂,而基于反式茋单草酰胺的衍生物可溶于大多数有机溶剂。在后一种化合物的结构中引入 C12 烷基链会导致溶解度降低,但会增加物质的凝胶化趋势。乙酯草酰胺基衍生物反式3a和氨基酸草酰胺基衍生物反式3e作为各种有机溶剂的有效凝胶剂。相比之下,由于其良好的溶解性,cis-3a 显示出较差的凝胶化能力或根本没有凝胶化能力。考虑到化合物 trans-3a 和 cis-3a 胶凝能力的差异以及分子二苯乙烯部分的光响应构象变化,实现了光控胶凝。FT-IR 和 1H NMR 光谱测量支持草酰胺片段之间的氢键在凝胶形成中起重要作用的观点。(© Wiley-VCH Verlag GmbH