Flexible Coordination Network Exhibiting Water Vapor–Induced Reversible Switching between Closed and Open Phases
Mohana Shivanna, Andrey A. Bezrukov, Victoria Gascón, Ken‐ichi Otake, Suresh Sanda, Daniel J. O’Hearn, Qing‐Yuan Yang, Susumu Kitagawa, Michael J. Zaworotko
Abstract
O 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.