CO₂-induced single-crystal to single-crystal transformations of an interpenetrated flexible MOF explained by in situ crystallographic analysis and molecular modeling

Abstract

A flexible twofold interpenetrated MOF reversibly switches between closed, narrow and large pore forms. In situ crystallographic analysis of a narrow-pore intermediate phase provides a detailed explanation of a plateau observed during desorption.

Temperature dependence of adsorption hysteresis in flexible metal organic frameworks

“…This structural change occurs when a critical transition pressure, p tr , is reached, causing a step change in the isotherm characterized by a finite transition width, σ (in Pa). Moreover, the phase change is hysteretic [20][21][22] with the transition pressure measured along the adsorption branch of the isotherm (increasing pressure), p ðadsÞ tr , being greater than that measured along the desorption branch, p ðdesÞ tr , with the difference δp tr ≡ ðp…”

Synthesis, structures and properties of metal–organic frameworks prepared using a semi-rigid tricarboxylate linker

“…S13 a property that is possessed by only a small fraction of MOFs. [23][24][25][26] Although the reversible transformation from 3 to 4 is not technically breathing as the topology of the network is not retained, this reversible structural change is interesting as it is accompanied by the breaking and formation of bonds.…”

Metal–organic tube or layered assembly: reversible sheet-to-tube transformation and adaptive recognition

“…As far as we know, many exible metal-organic frameworks (MOFs) can also be deformed by various external stimuli, including exchange and loss of solvent, temperature change, and pressure adjustment. [73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] However, exible MOFs like tube 1 that can accurately distinguish very similar molecules and produce adaptive deformation is rarely reported. [90][91][92] Such unusual deformation comprised of tube 1 not only advances our understanding of the interactions between adaptive host and guest molecules, 93 but also provides a new strategy for developing new porous materials for the separation of isomers or homologs with similar sizes.…”