Self-adjusting binding pockets enhance H₂ and CH₄ adsorption in a uranium-based metal–organic framework

Abstract

<p>Optimizing binding pocket geometries in MOFs for ideal interaction with target molecules remains a tremendous synthetic challenge. In the new MOF U(bdc)₂, self-adjusting binding pockets flex to bind differently sized guests H₂, CH₄ and DMF.</p>

Structural resolution and mechanistic insight into hydrogen adsorption in flexible ZIF-7

“…These close adsorption distances indicate relatively strong D 2 –arene interactions. 39 This strong interaction gives rise to the relatively high value for −Δ H ads at low loading concentrations (Fig. S6 † ).…”

“…As such, framework responsiveness is a possible path for achieving strong adsorption with chemically inert surface chemistries. 39 …”

“…As such, framework responsiveness is a possible path for achieving strong adsorption with chemically inert surface chemistries. 39 Here we showed that the benzene rings of the benzimidazolate ligands play a key role in the stabilization of the dense activated phase and in the formation of the sandwich-like adsorption motifs that serve as the primary adsorption sites. Therefore, we hypothesize that the adsorption step pressure at a given temperature can be nely tuned by synthetically modifying the benzimidazolate ligand along the benzene backbone.…”

“…[34][35][36] Moreover, there are only a handful of examples of materials which display stepped hydrogen adsorption and desorption in the pressure regime relevant for storage applications-yet these operate at 87 K or colder. 26,[37][38][39][40][41] The most notable of these is Co(bdp), 22,[42][43][44][45][46] which also exes following an 'accordion' type mechanism. Co(bdp) displays stepped hydrogen adsorption at cryogenic temperatures with large hysteresis.…”

Confinement synthesis in porous molecule-based materials: a new opportunity for ultrafine nanostructures

“…Many studies have shown that the different crystal faces exposed by MNPs exhibit different reactivity. For example, the catalytic rate of the Fe (111) surface surpasses those of its (100) and (110) surfaces by 16 and 418 times, respectively, in the catalytic synthesis of ammonia. 3 For the deoxygenation of aromatic epoxides, the Cu (100) surface exhibits more than 90% conversion, while the Cu (111) surface is only 35%.…”