Chemical Journal of Chinese Universities ›› 2021, Vol. 42 ›› Issue (Album-4): 1-7.doi: 10.7503/cjcu20200560

• Article •    

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

MENG Yan1, WANG Xiufeng2, ZHANG Li2, LIU Minghua2()   

  1. 1.CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,National Center of Nanoscience and Technology,Beijing 100190,China
    2.CAS Key Laboratory of Colloid Interface and Chemical Thermodynamics,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China
  • Received:2020-08-13 Online:2020-10-20 Published:2021-01-11
  • Contact: LIU Minghua E-mail:liumh@iccas.ac.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21890734)

Abstract:

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. NN′-bisoctadecyl-α-naphthalene-L-amino-glutamic acid diamide(1NLG) and NN′-bisoctadecyl-β-naphthalene-L-amino-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 amplification of supramolecular chirality.

Key words: Langmuir-Blodgett(LB) film, Helix structure, Supramolecular chirality, Circularly polarized luminescence

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