Stacked Reticular Frame Boosted Circularly Polarized Luminescence of Chiral Covalent Organic Frameworks

Chiral covalent organic frameworks (COFs) with circularly polarized luminescence (CPL) are intriguing as advanced chiroptical materials but have not been reported to date. We constructed chiroptical COF materials with CPL activity through the convenient Knoevenagel condensation of formyl‐functionali...

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Published inAngewandte Chemie International Edition Vol. 61; no. 28; pp. e202113979 - n/a
Main Authors Du, Cong, Zhu, Xuefeng, Yang, Chenchen, Liu, Minghua
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 11.07.2022
EditionInternational ed. in English
Subjects
chiral polymers
chiral reticular materials
Chirality
Circular polarization
circularly polarized luminescence
Covalence
covalent organic frameworks
Interlayers
Luminescence
Monomers
Polymers
stacking-induced emission enhancement
Structural analysis
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Summary:Chiral covalent organic frameworks (COFs) with circularly polarized luminescence (CPL) are intriguing as advanced chiroptical materials but have not been reported to date. We constructed chiroptical COF materials with CPL activity through the convenient Knoevenagel condensation of formyl‐functionalized axially chiral linkers and C3‐symmetric 1,3,5‐benzenetriacetonitrile. Remarkably, the as‐prepared chiral COFs showed high absorption and luminescent dissymmetric factors up to 0.02 (gabs) and 0.04 (glum), respectively. In contrast, the branched chiral polymers from the same starting monomers were CPL silent. Structural and spectral characterization revealed that the reticular frame was indispensable for CPL generation via confined chirality transfer. Moreover, reticular stacking boosted the CPL performance significantly due to the interlayer restriction of frame. This work demonstrates the first example of a CPL‐active COF and provides insight into CPL generation through covalent reticular chemistry, which will play a constructive role in the future design of high‐performance CPL materials. Circularly polarized luminescence (CPL) was achieved in olefin‐linked chiral covalent organic frameworks (COFs) via dual confinement of the covalent reticular frame and the noncovalent interlayer stacking.
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ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202113979