Influence of geometric and electronic features of pyridine derivatives and triethylamine on the formation of a metal carboxylate core in reactions producing cadmium(ii) pivalate complexes

Гоголева, Н. В.; Шмелев, М. А.; Кискин, М. А.; Александров, Г. Г.; Сидоров, А. А.; Еременко, И. Л.

doi:10.1007/s11172-016-1436-6

Cited by 14 publications

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“…The node of the MOF consists of three metal cations in two distinct coordination geometries: a central fac -ZnO 6 octahedron [Zn–O = 1.9236(7) Å] that is sandwiched between two ZnO 3 N tetrahedra [Figure a; Zn–O = 2.1085(7) Å]. Similar trimetallic nodes have been appearing more frequently in MOFs in recent years; − these trimetallic nodes have been featured in coordination polymers and molecular compounds. − Each node contains two fused sheets, rotated 60° to one another, where each sheet forms a 2D honeycomb/hexagonal (6,3) network topology containing one tetrahedral Zn 2+ and one of the ZnO 6 octahedral faces [Zn 1.5 (NH 2 BDC) 1.5 ; Figure ; Figure S1]. The nodes of each sheet alternate between connecting to the sheet above or to the sheet below (follow sheet B in Figures b and S2).…”

Section: Resultsmentioning

confidence: 99%

Ultrahigh Size Exclusion Selectivity for Carbon Dioxide from Nitrogen/Methane in an Ultramicroporous Metal–Organic Framework

et al. 2022

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Separations based on molecular size (molecular sieving) are a solution for environmental remediation. We have synthesized and characterized two new metal–organic frameworks (MOFs) (Zn 2 M; M = Zn, Cd) with ultramicropores (<0.7 nm) suitable for molecular sieving. We explore the synthesis of these MOFs and the role that the DMSO/H2O/DMF solvent mixture has on the crystallization process. We further explore the crystallographic data for the DMSO and methanol solvated structures at 273 and 100 K; this not only results in high-quality structural data but also allows us to better understand the structural features at temperatures around the gas adsorption experiments. Structurally, the main difference between the two MOFs is that the central metal in the trimetallic node can be changed from Zn to Cd and that results in a sub-Å change in the size of the pore aperture, but a stark change in the gas adsorption properties. The separation selectivity of the MOF when M = Zn is infinite given the pore aperture of the MOF can accommodate CO2 while N2 and/or CH4 is excluded from entering the pore. Furthermore, due to the size exclusion behavior, the MOF has an adsorption selectivity of 4800:1 CO2/N2 and 5 × 1028:1 CO2/CH4. When M = Cd, the pore aperture of the MOF increases slightly, allowing N2 and CH4 to enter the pore, resulting in a 27.5:1 and a 10.5:1 adsorption selectivity, respectively; this is akin to UiO-66, a MOF that is not able to function as a molecular sieve for these gases. The data delineate how subtle sub-Å changes to the pore aperture of a framework can drastically affect both the adsorption selectivity and separation selectivity.

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