Reversible Switching between Highly Porous and Nonporous Phases of an Interpenetrated Diamondoid Coordination Network That Exhibits Gate‐Opening at Methane Storage Pressures |
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| Authors: | Dr Qing‐Yuan Yang Dr Prem Lama Dr Susan Sen Dr Matteo Lusi Dr Kai‐Jie Chen Dr Wen‐Yang Gao Mohana Shivanna Dr Tony Pham Dr Nobuhiko Hosono Dr Shinpei Kusaka Dr John J Perry IV Prof?Dr Shengqian Ma Prof?Dr Brian Space Prof?Dr Leonard J Barbour Prof?Dr Susumu Kitagawa Prof?Dr Michael J Zaworotko |
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| Institution: | 1. Department of Chemical Sciences, Bernal Institute, University of Limerick, Limerick, Republic of Ireland;2. Department of Chemistry and Polymer Science, University of Stellenbosch, Matieland, South Africa;3. Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University Institute for Advanced Study, Kyoto University, Yoshida Ushinomiya-cho, Sakyo-ku, Kyoto, Japan;4. Department of Chemistry, University of South Florida, Tampa, FL, USA |
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| Abstract: | Herein, we report that a new flexible coordination network, NiL2 (L=4‐(4‐pyridyl)‐biphenyl‐4‐carboxylic acid), with diamondoid topology switches between non‐porous (closed) and several porous (open) phases at specific CO2 and CH4 pressures. These phases are manifested by multi‐step low‐pressure isotherms for CO2 or a single‐step high‐pressure isotherm for CH4. The potential methane working capacity of NiL2 approaches that of compressed natural gas but at much lower pressures. The guest‐induced phase transitions of NiL2 were studied by single‐crystal XRD, in situ variable pressure powder XRD, synchrotron powder XRD, pressure‐gradient differential scanning calorimetry (P‐DSC), and molecular modeling. The detailed structural information provides insight into the extreme flexibility of NiL2 . Specifically, the extended linker ligand, L , undergoes ligand contortion and interactions between interpenetrated networks or sorbate–sorbent interactions enable the observed switching. |
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| Keywords: | flexible microporous materials ligand contortion methane storage stepped adsorption isotherm |
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