二维界面上偶氮苯糖脂的光响应行为-物理化学学报.PDF

物理化学学报(Wuli Huaxue Xuebao) 836 Acta Phys. -Chim. Sin. 2017, 33 (4), 836－844 April [Article] doi: 10.3866/PKU.WHXB201612153 二维界面上偶氮苯糖脂的光响应行为 刘丹阳 王宛洛 徐首红* 刘洪来 (华东理工大学化学与分子工程学院，结构可控先进功能材料及其制备教育部重点实验室，上海200237) 摘要：设计合成了含偶氮苯基团的糖脂Gal-azo-Cn，通过Langmuir Blodgett (LB)膜、原子力显微镜技术对 该糖脂在气液界面上的光异构化行为进行研究。实验表明，气液界面上的纯偶氮苯糖脂及与磷脂混合形成单 分子膜的偶氮苯糖脂均具有反-顺、顺-反异构化行为。紫外光引起的异构化过程导致表面压力上升，但是由 于二维界面上膜压的存在对其反-顺异构化行为有抑制作用，膜压越大，压力上升越小，黑暗环境中顺-反异 构化过程则越快。对比纯偶氮苯糖脂的界面异构化行为，混合体系中磷脂分子与偶氮苯糖脂分子间的相互作 用，对二维界面上糖脂的反-顺异构化有促进作用，提高了偶氮苯糖脂的反-顺异构化程度。磷脂-糖脂混合体 系中，混合组分中含不饱和碳链的磷脂含量越高，膜的流动性越强，稳定性越差，对偶氮苯糖脂异构化行为 的促进作用越弱。 关键词：LB 技术；偶氮苯糖脂；光异构化；单分子层膜 中图分类号：O647 Photo-Responsivity of Azobenzene-Containing Glycolipid within Liquid-Gas Interface LIU Dan-Yang WANG Wan-Luo XU Shou-Hong* LIU Hong-Lai (Key Laboratory for Advanced Materials Institute of Fine Chemicals of the Education Ministry of China, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China) Abstract: Azobenzene-containing glycolipid, Gal-azo-Cn, was synthesized and its photoisomerization behavior within the liquid-gas interfaces was investigated by Langmuir Blodgett (LB) film measurements and atomic force microscopy. The results showed that Gal-azo-Cn could undergo trans-cis and cis-trans isomerization in both pure glycolipid and phospholipid-mixed films. UV-light induced isomerization increased the surface pressure. However, the membrane pressure within the liquid- gas interface could hinder the trans- cis isomerization. The high