3 years ago

A new Ni(salen)-based metal-organic framework: synthesis, structure and catalytic performance for CO2 cycloaddition with epoxides

Yanwei Ren, Yamei Fan, Huanfeng Jiang, Jiawei Li
A three-dimensional (3D) chiral metal-organic framework [Cd2(Ni(salen))(DMF)3]*4DMF*7H2O (1) based on a new enantiopure tetracarboxyl-functionalized metallosalen Ni(H4salen) [where H6salen is (R,R)-N,N′-bis(3-tert-butyl-5-(3,5-dicarboxybenzyl)salicylidene)-1,2-diphenylethylenediame], has been synthesized and characterized by Infrared spectrum, thermogravimetric analysis, nitrogen and carbon dioxide adsorption, powder and single-crystal X-ray diffractions. In 1, the dinuclear Cd2 cluster [Cd2(COO)4(DMF)3] as node is cross-linked by four isophthalate groups on salen ligands, forming a 2D lamellar structure, which are further linked by Ni(salen) into the 3D network with 1D open channel (∼7.0 × 8.0 Å2) along a axis. On account of its porosity, Lewis acid sites and moderate uptake for CO2, 1 can be used as an efficiently heterogeneous catalyst for the CO2 cycloaddition with epoxides under relatively mild conditions. Moreover, the bulky epoxide shows a decrease in the activity with an increase in the alkyl chain length of the substrate due to the confinement effect of 1, showing size-dependent selectivity.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ejic.201700871

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