Hierarchical superstructures with control of helicity from the self-assembly of chiral bent-core molecules

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题名:	Hierarchical superstructures with control of helicity from the self-assembly of chiral bent-core molecules
作者:	林世昌;Lin, Shih-Chieh;Ho, Rong-Ming;Chang, Chin-Yen;Hsu, Chain-Shu
贡献者:	生醫理工學院生命科學系
关键词:	Aggregates;aggregation;bent-core molecules;Benzoates;Chemistry;chirality;Formations;Helical;helical structures;Helicity;Merging;Ribbons;Self assembly;Superstructures
日期:	2012-07-16
上传时间:	2026-04-23 11:13:00 (UTC+8)
出版者:	Wiley-VCH Verlag;Weinheim: WILEY-VCH Verlag
摘要:	摘要： Herein, two asymmetric chiral bent‐core molecules, 3‐[(4‐[4‐(heptyloxy)benzoyl]oxybenzoyl)oxy]‐phenyl‐4‐[(4‐[(1R)‐1‐methylheptyl]oxybenzoyl)oxy] benzoate (BC7R) and 3‐[(4‐[4‐(heptyloxy)benzoyl]oxybenzoyl)oxy]‐phenyl‐4‐[(4‐[(1S)‐1‐methylheptyl]oxybenzoyl)oxy] benzoate (BC7S), were synthesized to demonstrate control of the helicity of their self‐assembled hierarchical superstructures. Mirror‐imaged CD spectra showed a split‐type Cotton effect after the formation of self‐assembled aggregates of BC7R and BC7S, thereby suggesting the formation of intermolecular exciton couplets with opposite optical activities. Both twisted and helical ribbons with preferential helicity that corresponded to the twisting character of the intermolecular exciton couplet were found in the aggregates. The formation of helical ribbons was attributed to the merging of twisted ribbons through an increase in width to improve morphological stability. As a result, control of the helicity of hierarchical superstructures from the self‐assembly of bent‐core molecules could be achieved by taking advantage of the transfer of chiral information from the molecular level onto the hierarchical scale. Let's twist again: The helicity of twisted and helical ribbons was controlled by introducing chiral entities into bent‐core molecules for their self‐assembly. The formation of helical ribbons was attributed to the merging together of twisted ribbons (see figure). 其他題名： Chem. Eur. J 出版者： Weinheim: WILEY-VCH Verlag 出版日期： 2012-07-16 出處： Chemistry : a European journal, 2012-07, Vol.18 (29), p.9091-9098 資源來源： Alma/SFX Local Collection 版權： Copyright © 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim 版權： Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. 版權： Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 識別號： ISSN: 0947-6539 識別號： ISSN: 1521-3765 識別號： EISSN: 1521-3765 識別號： DOI: 10.1002/chem.201200057 識別號： PMID: 22689474 識別號： CODEN: CEUJED
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