Molecular building blocks approach to the assembly of zeolite-like metal–organic frameworks (ZMOFs) with extra-large cavities

Abstract

Two novel porous anionic zeolite-like metal-organic frameworks, rho-ZMOF and sod-ZMOF, have been synthesized by metal-ligand-directed assembly of rigid and directional tetrahedral building units, InN4 synthesized in situ, and doubly deprotonated bis(bidentate) imidazoledicarboxylic acid ligands (HImDC) in the presence of different structure directing agents (SDAs).

Molecular Simulation Studies of Separation of CO2/N2, CO2/CH4, and CH4/N2 by ZIFs

“…linked by imidazolate ligands. [8][9][10][11][12][13][14][15] Among the many ZIFs synthesized, some of them have exceptional thermal and chemical stability 8,14 and exhibit great promise for gas storage and separation. [14][15][16] At present, many studies have been carried out on the adsorption and diffusion of pure gases in ZIFs.…”

Selective anion exchange with nanogated isoreticular positive metal-organic frameworks

“…Although ion-exchange of small or bulky guest species into charged frameworks has been observed [6][7][8][9][10]31 , most of the studies were focused on the capture of specific metal ions 6,7 or the enhancement of gas-sorption capability 8 . There are also examples of liquid chromatography for organic dyes using Zn MOFs with neutral framework [33][34][35] , which are less likely to involve ion-exchange.…”

“…The pore size of MOFs varies from a few angstroms to a few nanometres, making them ideal for incorporating species ranging from small gas molecules [24][25][26] and organic molecules 27,28 to large inorganic and organic species [29][30][31][32] . Although the adsorption and separation of gas molecules 11 and small organic molecules [12][13][14]28 (limited to one benzene ring, Mwo100 Da) have been extensively studied, the incorporation and separation of bulky molecules (B100 DaoMwoB1,000 Da), especially anionic, have been much less reported 15 .…”

Designer pores made easy

“…found in viruses or the carbon molecule buckminsterfullerene. Other metal-organic materials adopt two-and three-dimensional atomic frameworks that have topologies comparable to those of minerals 6,7 . One such topology, known as the cubic net, inspired the Dutch artist M. C. Escher (Fig.…”

“…1a). Aesthetic qualities aside, the cubic net is a good example of the framework of a metal-organic material -a modular structure in which the dimensions of the pores are controlled by the size of its molecular building-blocks 6 . The second desirable aspect of these materials is that a given topology can be constructed from very different molecular buildingblocks -anything from simple metal ions to complex organic molecules.…”