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Tuning the gate-opening pressure in a switching pcu coordination network, X-pcu-5-Zn, by pillar ligand substitution
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Date
2019
Abstract
Coordination networks that reversibly switch between closed and open phases are of topical interest since their stepped isotherms can offer higher working capacities for gasāstorage applications than the related rigid porous coordination networks. To be of practical utility, the pressures at which switching occurs, the gateāopening and gateāclosing pressures, must lie between the storage and delivery pressures. Here we study the effect of linker substitution to fineātune gateāopening and gateāclosing pressure. Specifically, three variants of a previously reported pcuātopology MOF, Xāpcuā5āZn, have been prepared: Xāpcuā6āZn, 6=1,2ābis(4āpyridyl)ethane (bpe), Xāpcuā7āZn, 7=1,2ābis(4āpyridyl)acetylene (bpa), and Xāpcuā8āZn, 8=4,4ā²āazopyridine (apy). Each exhibited switching isotherms but at different gateāopening pressures. The N2, CO2, C2H2, and C2H4 adsorption isotherms consistently indicated that the most flexible dipyridyl organic linker, 6, afforded lower gateāopening and gateāclosing pressures. This simple design principle enables a rational control of the switching behavior in adsorbent materials.
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peer-reviewed
Publisher
John Wiley & Sons, Inc.
Citation
Angewandte Chemie International Edition;58, 50, pp. 18212-18217
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Funding Information
Science Foundation Ireland (SFI), National Natural Science Foundation of China