Captured Molecules in Coordination Frameworks

Abstract

In recent years, a new class of porous materials based on a combination of organic components and metal centers has emerged, namely, microporous coordination polymers (MCPs), in which the chemical properties as well as the pore dimensions affect the incorporation of “guest” molecules within the pores. In this article, we describe the ability of MCPs to store gas molecules, which is ascribed to framework regularity and high porosity, and the unique capacity of certain MCPs to capture molecules selectively by well-defined interactions with organic functional groups.

Mixed-matrix membranes containing MOF-5 for gas separations

“…First, these materials possess high surface areas (e.g. MOF-177 = 4500 m 2 /g [27], MOF-5 = 3000 m 2 /g [28,29], and Cu-MOF = 3200 m 2 /g [30]) and controlled porosity, which makes them good candidates for gas storage [31] and catalysis [32]. Second, some MOFs may have affinity for certain gases and, therefore, could be used in gas separation (e.g.…”

Antiferromagnetic Porous Metal–Organic Framework Containing Mixed-Valence [MnII4MnIII2(μ4-O)2]10+ Units with Catecholase Activity and Selective Gas Adsorption

“…The molecular materials which are synthesized aiming primarily to study one property can be made multifunctional by judicious choice of metal ions and ligands. For example, by connecting polynuclear metal clusters with suitable linkers, it is possible to prepare materials showing gas adsorption, fluorescence, or catalytic activity besides magnetism . The construction of magnetic metal–organic frameworks (MOFs) based on metallic cluster building blocks is still a major challenge mainly because of two interrelated aspects: (i) it is difficult to find appropriate polymeric magnetic building blocks able to act as node and stable enough to resist decomposition during the polymerization reaction, and (ii) the linkers between the building blocks should be capable of retaining and/or transmitting the inherent properties of the metallic cluster to the extended system and should also be inactive enough to avoid the decomposition of the metallic cluster core into monomeric complexes …”

A trimanganese cluster-based 2D layer framework with facile single-crystal-to-single-crystal transformation to afford a 1D chain structure

“…As witnessed by the activity in the past few decades, there still remains considerable interest in metal-organic coordination polymers, mostly constructed from mononuclear metal centers and organic ligands, owing to their intriguing structural topologies and crystal packing motifs, [1][2][3][4][5][6] along with their anticipated applications as functional materials. [7][8][9][10][11][12][13][14] More recently, a certain amount of attention has been paid to the use of multimetallic clusters as building units in the synthesis of these polymeric materials, since the metallic clusters may introduce their inherent extraordinary chemicophysical properties to the polymeric frameworks, and the usually exceptional stability of polymerized products makes them more promising in applications than the metallic clusters themselves. [15][16][17][18][19][20][21] The magnetic properties of trinuclear clusters of type [Mn 3 (RCOO) 6 (L) 2 ], exhibiting spin crossover at high magnetic field, have been well documented.…”