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Title: Flexible Coordination Network Exhibiting Water Vapor–Induced Reversible Switching between Closed and Open Phases
Authors: Shivanna, Mohana
Bezrukov, Andrey A.
Gascón-Pérez, Victoria
Otake, Ken-ichi
Sanda, Suresh
O’Hearn, Daniel J.
Yang, Qing-Yuan
Kitagawa, Susumu
Zaworotko, Michael J.
Author's alias: 大竹, 研一
北川, 進
Keywords: sorbents
structural flexibility
water sorption properties
atmospheric water harvesting
metal−organic frameworks
stepped isotherm
Issue Date: 31-Aug-2022
Publisher: American Chemical Society (ACS)
Journal title: ACS Applied Materials & Interfaces
Volume: 14
Issue: 34
Start page: 39560
End page: 39566
Abstract: That physisorbents can reduce the energy footprint of water vapor capture and release has attracted interest because of potential applications such as moisture harvesting, dehumidification, and heat pumps. In this context, sorbents exhibiting an S-shaped single-step water sorption isotherm are desirable, most of which are structurally rigid sorbents that undergo pore-filling at low relative humidity (RH), ideally below 30% RH. Here, we report that a new flexible one-dimensional (1D) coordination network, [Cu(HQS)(TMBP)] (H₂HQS = 8-hydroxyquinoline-5-sulfonic acid and TMBP = 4, 4′-trimethylenedipyridine), exhibits at least five phases: two as-synthesized open phases, α ⊃ H₂O and β ⊃ MeOH; an activated closed phase (γ); CO₂ (δ ⊃ CO₂) and C₂H₂ (ϵ ⊃ C₂H₂) loaded phases. The γ phase underwent a reversible structural transformation to α ⊃ H₂O with a stepped sorption profile (Type F-IV) when exposed to water vapor at <30% RH at 300 K. The hydrolytic stability of [Cu(HQS)(TMBP)] was confirmed by powder X-ray diffraction (PXRD) after immersion in boiling water for 6 months. Temperature-humidity swing cycling measurements demonstrated that working capacity is retained for >100 cycles and only mild heating (<323 K) is required for regeneration. Unexpectedly, the kinetics of loading and unloading of [Cu(HQS)(TMBP)] compares favorably with well-studied rigid water sorbents such as Al-fumarate, MOF-303, and CAU-10-H. Furthermore, a polymer composite of [Cu(HQS)(TMBP)] was prepared and its water sorption retained its stepped profile and uptake capacity over multiple cycles.
Rights: Copyright © 2022 The Authors. Published by American Chemical Society
This is an open access article published under a Creative Commons Attribution License.
DOI(Published Version): 10.1021/acsami.2c10002
PubMed ID: 35975756
Appears in Collections:Journal Articles

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