Flexible interlocked porous frameworks allow quantitative photoisomerization in a crystalline solid

Yongtai Zheng, Hiroshi Sato (), Pengyan Wu, Hyung Joon Jeon, Ryotaro Matsuda and Susumu Kitagawa ()
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Yongtai Zheng: Kyoto University
Hiroshi Sato: The University of Tokyo
Pengyan Wu: Kyoto University
Hyung Joon Jeon: Kyoto University
Ryotaro Matsuda: Kyoto University
Susumu Kitagawa: Kyoto University

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Photochromic molecules have shown much promise as molecular components of stimuli-responsive materials, but despite recent achievements in various photoresponsive materials, quantitative conversion in photochemical reactions in solids is hampered by the lack of intrinsic structural flexibility available to release stress and strain upon photochemical events. This issue remains one of the challenges in developing solid-state photoresponsive materials. Here, we report a strategy to realize photoresponsive crystalline materials showing quantitative reversible photochemical reactions upon ultraviolet and visible light irradiation by introducing structural flexibility into crystalline porous frameworks with a twofold interpenetration composed of a diarylethene-based ligand. The structural flexibility of the porous framework enables highly efficient photochemical electrocyclization in a single-crystal-to-single-crystal manner. CO2 sorption on the porous crystal at 195 K is reversibly modulated by light irradiation, and coincident X-ray powder diffraction/sorption measurements clearly demonstrate the flexible nature of the twofold interpenetrated frameworks.

Date: 2017
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DOI: 10.1038/s41467-017-00122-5

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