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Transcription of Chirality from Metal–Organic Framework to Polythiophene

Here, we report an unprecedented chirality transfer from a metal–organic framework (MOF) to a polymer. In this work, unsubstituted polythiophene (PTh) was prepared in the nanochannels of a chiral MOF. Circular dichroism spectroscopy revealed that nanoconfinement of the polymer chains could endow opt...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2019-12, Vol.141 (50), p.19565-19569
Main Authors: Kitao, Takashi, Nagasaka, Yujiro, Karasawa, Masanobu, Eguchi, Toshiki, Kimizuka, Nobuo, Ishii, Kazuyuki, Yamada, Teppei, Uemura, Takashi
Format: Article
Language:English
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Summary:Here, we report an unprecedented chirality transfer from a metal–organic framework (MOF) to a polymer. In this work, unsubstituted polythiophene (PTh) was prepared in the nanochannels of a chiral MOF. Circular dichroism spectroscopy revealed that nanoconfinement of the polymer chains could endow optically inactive PTh with a chiral nature. The thickness of polymer chain assemblies could be controlled by tuning the loading amount of PTh, which resulted in a drastic change in the chiroptical properties. Note that PTh liberated from the host still exhibited chirality even without the chiral support. Remarkably, the recovered PTh presented high thermal stability of chirality up to 250 °C. Our findings show that the encapsulation of the polymer chains in chiral MOFs is a simple and effective methodology not only to express the chirality of polymers but also to elucidate the inter- and intrachain chirality in polymer assemblies.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.9b10880