Metal cation substitution can tune CO2, H2O and CH4 switching pressure in transiently porous coordination networks

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-08, Vol.11 (30), p.16019-16026
• Main Authors: Nikolayenko, Varvara I, Castell, Dominic C, Sensharma, Debobroto, Shivanna, Mohana, Loots, Leigh, Otake, Ken-ichi, Kitagawa, Susumu, Barbour, Leonard J, Zaworotko, Michael J
• Format: Article
• Language: English
• Subjects: Cadmium; Carbon dioxide; Chemistry; Cobalt; Coordination; Metal ions; Methane; Natural gas; Networks; Porosity; Switching; Thermal management; Work capacity; Zinc
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/d3ta03300g

Compared to rigid physisorbents, switching coordination networks that reversibly transform between closed (non-porous) and open (porous) phases offer promise for gas/vapour storage and separation owing to their improved working capacity and desirable thermal management properties. We recently introduced a coordination network, X-dmp-1-Co, which exhibits switching enabled by transient porosity. The resulting “open” phases are generated at threshold pressures even though they are conventionally non-porous. Herein, we report that X-dmp-1-Co is the parent member of a family of transiently porous coordination networks [X-dmp-1-M] (M = Co, Zn and Cd) and that each exhibits transient porosity but switching events occur at different threshold pressures for CO2 (0.8, 2.1 and 15 mbar, for Co, Zn and Cd, respectively, at 195 K), H2O (10, 70 and 75% RH, for Co, Zn and Cd, respectively, at 300 K) and CH4 (