Issue 41, 2012

Bifunctional 3D Cu-MOFs containing glutarates and bipyridylligands: selective CO2sorption and heterogeneous catalysis

Abstract

We report bifunctional three-dimensional (3D) Cu-MOFs with high selectivity of CO2 over N2 and H2 as well as high catalytic activity for transesterification of esters. The Cu-MOFs containing Cu2 dinuclear units connected by glutarates and bipyridyl ligands are formulated as [{Cu2(Glu)2(μ-bpa)}·(CH3CN)]n (1) and [{Cu2(Glu)2(μ-bpp)}·(C3H6O)]n (2) (Glu = glutarate, bpa = 1,2-bis(4-pyridyl)ethane, bpp = 1,3-bis(4-pyridyl)propane). These two new bifunctional 3D Cu-MOFs possess very similar pore shape with different pore dimensions. Their gas sorption behaviors were investigated by using CO2, N2 and H2 at suitable temperatures. Both MOFs exhibited good CO2 selectivity over N2 and H2. MOF 1 having a smaller pore dimension exhibited much higher CO2 adsorption enthalpy than MOF 2 having a larger pore dimension. However, MOF 2 exhibited more enhanced CO2 uptake ability than MOF 1. A subtle variation of pore dimension indeed influenced the CO2 uptake ability somewhat significantly especially at higher temperatures such as 273 K and 298 K. Heterogeneous catalytic activities of the MOFs were also investigated in detail. Only MOF 1 appeared to be an efficient, mild, and easily recyclable heterogeneous catalyst for the transesterification of esters and constitutes a promising class of heterogeneous catalysts that allowed reuse without a significant loss of activity through twenty runs with ester.

Graphical abstract: Bifunctional 3D Cu-MOFs containing glutarates and bipyridyl ligands: selective CO2 sorption and heterogeneous catalysis

Supplementary files

Article information

Article type
Paper
Submitted
19 Apr 2012
Accepted
14 Aug 2012
First published
14 Aug 2012

Dalton Trans., 2012,41, 12759-12765

Bifunctional 3D Cu-MOFs containing glutarates and bipyridyl ligands: selective CO2 sorption and heterogeneous catalysis

I. H. Hwang, J. M. Bae, W. Kim, Y. D. Jo, C. Kim, Y. Kim, S. Kim and S. Huh, Dalton Trans., 2012, 41, 12759 DOI: 10.1039/C2DT31427D

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