ic9b00761_si_001.pdf (1.05 MB)
Direct in Situ Crystallographic Visualization of a Dual Mechanism for the Uptake of CO2 Gas by a Flexible Metal–Organic Framework
journal contribution
posted on 2019-06-10, 17:36 authored by Phumile Sikiti, Charl X. Bezuidenhout, Dewald P. van Heerden, Leonard J. BarbourWe report a flexible metal–organic
framework, [Co2(OBA)2(BPMP)]n (COB), with a new network topology. COB displays structural flexibility under CO2 gas pressure
at 298 K, and the resultant porous phases have been characterized
by in situ X-ray diffraction analysis. We show that activation yields
a framework with discrete voids and substantial reduction in guest-accessible
volume. Single-crystal X-ray diffraction analysis under controlled
CO2 pressure shows that COB exhibits a breathing
mode of flexibility, combined with an overall swelling of the framework.
This combination of mechanisms is highly unusual.