Porous Cobalt(II)–Organic Frameworks with Corrugated Walls: Structurally Robust Gas‐Sorption Materials

Abstract

Resilient hosts: The porous coordination solids CUK‐1 (see structure; Co purple, C gray, N blue, O red/pink) and CUK‐2 are synthesized from unsymmetrical ligands and CoII ions. Even after the removal of co‐crystallized guests, the host frameworks are exceptionally stable. CUK‐1 shows a high capacity for H2 adsorption and is one of very few materials capable of separating N2 from O2.

Gas‐Sorption Selectivity of CUK‐1: A Porous Coordination Solid Made of Cobalt(II) and Pyridine‐2,4‐ Dicarboxylic Acid

“…Interestingly, the surface hydroxyl groups were not completely removed, even at 423 K, which is noticeably different from the thermogravimetric analysis profile of CUK-1 in a flow of nitrogen. [7] The most plausible explanation for this observation is attributed to the difference in dehydration conditions. It is believed that structural changes may accompany the cooling of the dehydrated material or sorption of guest species that prevent molecules from entering the pores of CUK-1.…”

“…[7] This material, which forms with the formula [Co 3 (2,4-pdc) 2 (l 3 -OH) 2 ] · 9H 2 O (2,4-pdc = pyridine-2,4-dicarboxylic acid dianion, NC 5 H 3 -(CO 2 ) 2 -2,4) and is herein referred to as CUK-1 (Cambridge University-KRICT), crystallizes in the monoclinic space group C2/c. [7] It has 1D diamond-shaped channels that traverse the structure and contain guest water molecules of crystallization, as illustrated in Figure 1. Here we present the unusual and selective sorption properties of light gases on CUK-1.…”

Microwave assisted hydrothermal synthesis of a novel CuI-sulfate-pyrazine MOF

“…Open-framework metal-organic polymers, derived from the combination of selected transition metal and multidentate bridging ligands, have attracted much attention in the last decades due to their potential as purpose-built materials with practical properties such as gas storage [1][2][3][4], catalysis [5], optics [6] and magnetisms [7]. In addition, they have been recently investigated as novel nanomaterials [8][9][10][11][12].…”

Hydrogen Adsorption on Metal Organic Framework Materials for Storage Applications

“…• Carbons: 1.4-12.5 kJ mol À1 ; [40,61,62,64,87,191] • Zeolites: 5.9-18.2 kJ mol À1 ; [62,91,[202][203][204][205] • Silicas: 5.4-10.4 kJ mol À1 ; [62] • MOFs: 5.1-13.5 kJ mol À1 ; [34,36,38,50,57,58,60,[119][120][121]127,[129][130][131][132]136,137,141,[144][145][146]149,150,156,[170][171][172][173][174][175][176][177][178][179][180][181][182]…”