Co2 and Co3 Mixed Cluster Secondary Building Unit Approach toward a Three-Dimensional Metal-Organic Framework with Permanent Porosity

Abstract

Large and permanent porosity is the primary concern when designing metal-organic frameworks (MOFs) for specific applications, such as catalysis and drug delivery. In this article, we report a MOF Co11(BTB)6(NO3)4(DEF)2(H2O)14 (1, H3BTB = 1,3,5-tris(4-carboxyphenyl)benzene; DEF = N,N-diethylformamide) via a mixed cluster secondary building unit (SBU) approach. MOF 1 is sustained by a rare combination of a linear trinuclear Co3 and two types of dinuclear Co2 SBUs in a 1:2:2 ratio. These SBUs are bridged by BTB ligands to yield a three-dimensional (3D) non-interpenetrated MOF as a result of the less effective packing due to the geometrically contrasting SBUs. The guest-free framework of 1 has an estimated density of 0.469 g cm−3 and exhibits a potential solvent accessible void of 69.6% of the total cell volume. The activated sample of 1 exhibits an estimated Brunauer-Emmett-Teller (BET) surface area of 155 m2 g−1 and is capable of CO2 uptake of 58.61 cm3 g−1 (2.63 mmol g−1, 11.6 wt % at standard temperature and pressure) in a reversible manner at 195 K, showcasing its permanent porosity.

Visible Light-Driven Metal–Organic Framework-Mediated Activation and Utilization of CO2 for the Thiocarboxylation of Olefins

“…However, the peak intensities for these two patterns differ considerably. The main reason for this is due to the different orientations of various crystallites in the bulk material. , On the other hand, the pore filling effect is one of the most crucial reasons behind the variation of the diffraction intensity of the experimental (solvated samples) PXRD pattern with reference to that of the theoretical (simulated) pattern. , …”

“…32,33 On the other hand, the pore filling effect is one of the most crucial reasons behind the variation of the diffraction intensity of the experimental (solvated samples) PXRD pattern with reference to that of the theoretical (simulated) pattern. 34,35 3.1.2. N 2 Sorption Isotherm.…”

Novel Nanoporous Ti-Phosphonate Metal–Organic Framework for Selective Sensing of 2,4,6-Trinitrophenol and a Promising Electrode in an Energy Storage Device

“…Nevertheless, the peak intensities for these two patterns are quite different. This is basically happened either due to different orientations of the crystallites in the bulk material or the pore filling effect. , Typically, the intensity variation (either increased or decreased) between the simulated (solvent free samples) and experimental (solvated samples) XRD pattern is described by the pore filling effect. − There are also unavoidable TiO 2 peaks, which are formed during the MOF synthesis due to the fast hydrolysis of titanium­(IV) isopropoxide. We have marked these peaks in the PXRD pattern (Figure ).…”

A Heterometallic Three-Dimensional Metal−Organic Framework Bearing an Unprecedented One-Dimensional Branched-Chain Secondary Building Unit

“…The thermally unstable nature of MOF 1 prevented us from studying its surface area via gas adsorption, and our preliminary experiments suggested that MOF 1 exhibits no adsorption of N 2 at 77 K (Supplementary Figure S2), presumably due to the collapse of the 3D framework. The Fourier-transform infrared spectrum (FT-IR) of MOF 1 contained absorptions at 2975 cm −1 , 2930 cm −1 , and 1652 cm −1 corresponding to the-CH 3 , -CH 2 -, and -C=O bonds of te DEF solvate [71,72]. In addition, peaks at 1610 cm −1 , 1536 cm −1 , and 1397 cm −1 were assignable as the asymmetrical and symmetrical stretching vibrations of the carboxylate [66,73].…”

“…Molecules 2019, 24, x; doi: www.mdpi.com/journal/molecules [71,72]. In addition, peaks at 1610 cm −1 , 1536 cm −1 , and 1397 cm −1 were assignable as the asymmetrical and symmetrical stretching vibrations of the carboxylate [66,73].…”