Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 36, Pages 15517-15521Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202003186
Keywords
energy landscape; flexibility; molecular recognition; porous coordination polymer; structural-deformation energy
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Funding
- KAKENHI from the Japan Society for the Promotion of Science (JSPS) [JP25000007, JP18H05262, JP19K15584]
- KAKENHI [JP18H02072, JP19H05381]
- National Natural Science Foundation of China [21906120, 51978491]
- Japan Synchrotron Radiation Research Institute (JASRI) [2019B1296, 2019A1136]
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To achieve unique molecular-recognition patterns, a rational control of the flexibility of porous coordination polymers (PCPs) is highly sought, but it remains elusive. From a thermodynamic perspective, the competitive relationship between the structural deformation energy (E-def) of soft PCPs and the guest interaction is key for selective a guest-triggered structural-transformation behavior. Therefore, it is vital to investigate and control E-def to regulate this competition for flexibility control. Driven by these theoretical insights, we demonstrate an E-def-modulation strategy via encoding inter-framework hydrogen bonds into a soft PCP with an interpenetrated structure. As a proof of this concept, the enhanced E-def of PCP enables a selective gate-opening behavior toward CHCl3 over CH2Cl2 by changing the adsorption-energy landscape of the compounds. This study provides a new direction for the design of functional soft porous materials.
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