Dynamic Gas‐Inclusion in a Single Crystal

Abstract

In solid‐state science, most changing phenomena have been mysterious. Furthermore, the changes in chemical composition should be added to mere physical changes to also cover the chemical changes. Here, the first success in characterizing the nature of gas inclusion in a single crystal is reported. The gas inclusion process has been thoroughly investigated by in situ optical microscopy, single‐crystal X‐ray diffraction analyses, and gas adsorption measurements. The results demonstrated an inclusion action of a first‐order transition behavior induced by a critical concentration on the phase boundary. The transfer of phase boundary and included gas are strongly related. This relationship can generate the dynamic features hidden in the inclusion phenomena, which can lead to the guest capturing and transfer mechanism that can apply to spatiotemporal inclusion applications by using host solids.

Robust Multifunctional Yttrium-Based Metal–Organic Frameworks with Breathing Effect

“…15 According to the classification of framework robustness, 6 MOFs which exhibit flexible and dynamic structures with the ability to change their channels or pores reversibly as a consequence of external stimuli constitute the third generation MOFs. 16 It is, thus, of great importance to study the structural response of a MOF to its surrounding environment, in order to fully assess the extent of potential applications of such materials. 17,18 There are a considerable number of examples that have been reported showing "breathing MOF" materials with two (or more) stable states as a function of adsorbed guests.…”