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Self-Assembly of Helical Nanofibrous Chiral Covalent Organic Frameworks

Journal Article · · Angewandte Chemie (International Edition)
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  1. South China Normal University (SCNU), Guangzhou (China). GDMPA Key Lab. for Process Control and Quality Evaluation of Chiral Pharmaceuticals
  2. Nanjing Univ. (China). Key Lab. of Coordination Chemistry
  3. South China Normal University (SCNU), Guangzhou (China). GDMPA Key Lab. for Process Control and Quality Evaluation of Chiral Pharmaceuticals; SCNU Qingyuan Inst. of Science and Technology Innovaiton Co., Ltd. (China)
  4. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Molecular Foundry

Despite significant progress on the design and synthesis of covalent organic frameworks (COFs), precise control over microstructures of such materials remains challenging. Herein, two chiral COFs with well-defined one-handed double-helical nanofibrous morphologies were constructed via an unprecedented template-free method, capitalizing on the diastereoselective formation of aminal linkages. Detailed time-dependent experiments reveal the spontaneous transformation of initial rod-like aggregates into the double-helical microstructures. Impoirtantly, we have further demonstrated that the helical chirality and circular dichroism signal can be facilely inversed by simply adjusting the amount of acetic acid during synthesis. Moreover, by transferring chirality to achiral fluorescent molecular adsorbents, the helical COF nanostructures can effectively induce circularly polarized luminescence with the highest luminescent asymmetric factor (glum) up to ≈0.01.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2328534
Alternate ID(s):
OSTI ID: 1909482
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 4 Vol. 62; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (5)