Stereoselective synthesis and properties of 1,3-bis(dicyanomethylidene)indane-5-carboxylic acid acceptor fragment containing nonlinear optical chromophores
作者:Kaspars Traskovskis、Valdis Kokars、Andrejs Tokmakovs、Igors Mihailovs、Edgars Nitiss、Marina Petrova、Sergey Belyakov、Martins Rutkis
DOI:10.1039/c6tc00203j
日期:——
compounds are chiral and were acquired as a racemic mixture. The subsequent functionalization of the carboxylic acid group with 5,5,5-triphenylpentan-1-ol yielded solution-processable glass forming materials (6, 8, 10, 13) with glass transition temperature values of 76–134 °C. The nonlinear optical (NLO) properties of these compounds were characterized using quantum chemical calculations and second harmonic
合成并表征了一系列使用茚满-1,3-二酮5-羧酸(IDCA)和新型1,3-双(二氰基亚甲基)茚满5-羧酸(CICA)电子受体片段的有机推挽型生色团。 。NMR和X射线分析表明,与CICA片段的缩合反应是立体选择性的,并产生具有E双键构型的亚苄基和甲亚胺。由于非平面几何形状,这些化合物是手性的,并以外消旋混合物形式获得。羧酸基团的后续官能化与5,5,5- triphenylpentan -1-醇,得到溶液加工的玻璃形成材料(6,8,10,13)的玻璃化转变温度为76–134°C。这些化合物的非线性光学(NLO)性能使用量子化学计算和电晕极细玻璃状薄膜中的二次谐波生成(SHG)测量来表征。由于与平坦的IDCA基化合物相比,固相堆积不那么明显,因此CICA基材料的扭曲几何形状对宏观NLO性能是有益的。在化合物13中,分子的受体和供体端都存在位点隔离基团,导致NLO效率显着提高。基于CICA的N,