Synthesis and Self-Assembly of Cube-Disk Shape Amphiphiles

【作者】 张梦瑶； 周宇； 顾克骅； 杨帅奇； 范星河； 沈志豪；

【Author】 Mengyao Zhang;Yu Zhou;Kehua Gu;Shuaqi Yang;Xinghe Fan;Zhihao Shen;Beijing National Laboratory for Molecular Sciences,Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,College of Chemistry and Molecular Engineering,Peking University;

【机构】 Beijing National Laboratory for Molecular Sciences,Key Laboratory of Polymer Chemistry and Physics of Ministry of Education,College of Chemistry and Molecular Engineering,Peking University；

【摘要】 Shape amphiphiles usually refer to molecules composed of segments with distinct shapes.1 These shape amphiphiles have rich phase behaviors and unusual hierarchal structures. Thus the design of new shape amphiphiles is essential to achieve hierarchal structures and functional materials. Hexa-peri-hexabenzocoronenes(HBCs) with different substitution patterns are known to self-assemble into columnar liquid crystalline phases in bulk and into nanotubes in solution.2, 3 In addition, HBCs have the highest one-dimensional charge-transfer mobility among discotic liquid crystals. Polyhedral oligomeric silsesquioxane(POSS) with a cubic shape is perhaps the smallest nanoparticle. And the surface groups of POSS can be easily modified via various reactions.4 Thus, covalently linking HBC and POSS may lead to interesting hierarchical structures. In this work, we synthesized a series of cube-disk shape amphiphiles, HBC-POSS dyads, with different linkers. We focused on the effect of distinct shapes and competing interactions on the self-assembling behaviors of the cube-disk dyads in bulk. From the results of thermogravimetric analysis, the dyads have good thermal stabilities. In addition, the ordered structures of HBC-POSS dyads in bulk are investigated by using differential scanning calorimetry, wide-angle X-ray diffraction, and small-angle X-ray scattering.更多还原

【Abstract】 Shape amphiphiles usually refer to molecules composed of segments with distinct shapes.1 These shape amphiphiles have rich phase behaviors and unusual hierarchal structures. Thus the design of new shape amphiphiles is essential to achieve hierarchal structures and functional materials. Hexa-peri-hexabenzocoronenes(HBCs) with different substitution patterns are known to self-assemble into columnar liquid crystalline phases in bulk and into nanotubes in solution.2, 3 In addition, HBCs have the highest one-dimensional charge-transfer mobility among discotic liquid crystals. Polyhedral oligomeric silsesquioxane(POSS) with a cubic shape is perhaps the smallest nanoparticle. And the surface groups of POSS can be easily modified via various reactions.4 Thus, covalently linking HBC and POSS may lead to interesting hierarchical structures. In this work, we synthesized a series of cube-disk shape amphiphiles, HBC-POSS dyads, with different linkers. We focused on the effect of distinct shapes and competing interactions on the self-assembling behaviors of the cube-disk dyads in bulk. From the results of thermogravimetric analysis, the dyads have good thermal stabilities. In addition, the ordered structures of HBC-POSS dyads in bulk are investigated by using differential scanning calorimetry, wide-angle X-ray diffraction, and small-angle X-ray scattering.更多还原