不同取代位置的萘衍生两亲分子在气/液界面组装膜中的螺旋结构与圆偏振发光  

Helical Structure and Circularly Polarized Luminescence of Naphthalene Derived Amphiphilic Molecules Through Air/water Interface Assembly

作　　者：孟妍 王秀凤 张莉[2] 刘鸣华[2] MENG Yan;WANG Xiufeng;ZHANG Li;LIU Minghua(CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,National Center of Nanoscience and Technology,Beijing 100190,China;CAS Key Laboratory of Colloid Interface and Chemical Thermodynamics,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]国家纳米科学中心,中国科学院纳米系统与多级次制造重点实验室,北京100190 [2]中国科学院化学研究所胶体、界面与化学热力学重点实验室,北京100190

出　　处：《高等学校化学学报》2021年第4期1253-1259,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21890734,21890730)资助.

摘　　要：Langmuir-Blodgett(LB)技术可在二维气/液界面上精确地控制分子之间的排列及堆积方式,构建有序超薄膜及纳米组装体.同时,界面这一不对称环境也可有效放大组装体的手性信息,实现超分子体系中的手性传递和手性放大.本文研究了萘环取代位置不同的两种手性两亲分子——N,N′-双十八烷基-α-萘-L-氨基-谷氨酸二酰胺(1NLG)和N,N′-双十八烷基-β-萘-L-氨基-谷氨酸二酰胺(2NLG)在气/液界面的铺展及组装行为,发现同分异构效应影响了两亲分子在界面的排列,1NLG组装形成了均一的纳米带状结构,而2NLG则形成了左手螺旋结构,并且2NLG薄膜表现出圆偏振发光(CPL)性质,其不对称因子(glum)比三维体相组装体(超分子凝胶)大23倍,表明界面促进了超分子手性的放大.Langmuir-Blodgett(LB)technology precisely control the arrangement and stacking of molecules to construct ordered ultrathin films and assemblies on the two-dimensional air/water interface.Meanwhile,the asymmetric environment of the interface can also effectively amplify chirality of the assembly.In this paper,two chiral amphiphilic molecules with different substitution positions of naphthalene ring were studied.N,N′-bisoctadecyl-α-naphthalene-L-amino-glutamic acid diamide(1NLG)and N,N′-bisoctadecyl-β-naphthalene-Lamino-glutamic acid diamide(2NLG)were spread and assembled at air/water interface.It was showed that the substitution position affected the arrangement of amphiphilic molecules at the air/water interface.1NLG formed uniform nanobelt structure,while 2NLG formed left-handed helix structures.Also,2NLG LB films exhibited circularly polarized luminescence(CPL),and its dissymmetry factor(glum)was significantly enhanced than that of three-dimensional assemblies(supramolecular gel),indicating that the interface promoted the amplifi⁃cation of supramolecular chirality.

关 键 词：Langmuir-Blodgett(LB)膜 螺旋结构 超分子手性 圆偏振发光 

分 类 号：O647.11[理学—物理化学]