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Issue 23, 2014
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Variation of CO2 adsorption in isostructural Cd(ii)/Co(ii) based MOFs by anion modulation

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Abstract

A potential multidentate tris-pyridyl ligand has been synthesized, and later employed for the tailoring of four isostructural cadmium(II)/cobalt(II) two dimensional (2D) metal organic frameworks, [[M(dmpt)2(X)2xS]n, where S = solvent, M = Cd2+, (X = NO3 (1), Br (2), I (3)); M = Co2+ (X = Cl (4)), dmpt = 4′-(3,4-dimethoxyphenyl)-4,2′:6′,4′′-terpyridine. These complexes have been characterized by infrared (IR) spectroscopy, elemental analysis, thermogravimetric analysis (TGA) and powder X-ray diffraction (PXRD) and single crystal X-ray diffraction analyses. Single crystal X-ray diffraction analysis reveals that the complexes (1–4) are isostructural and crystallize in the monoclinic C2/c space group. They possess similar structural features such as metal-coordination environment, network topology, π⋯π interactions and exhibit a 2D uninodal 44-sql topology with slightly tuned cavities. In complexes 1–4, the [[M(dmpt)2(X)2xS] coordination monomer acts as the building block, building 2D layers which are further stacked up via Van der Waals interactions into a three-dimensional (3D) framework. The effect of weak interactions on the structural dynamics of the systems has also been studied. Furthermore, a gas adsorption study of these complexes demonstrates that they are affected by the impact of directing anions inside the pores.

Graphical abstract: Variation of CO2 adsorption in isostructural Cd(ii)/Co(ii) based MOFs by anion modulation

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Supplementary files

Article information


Submitted
09 Jan 2014
Accepted
03 Mar 2014
First published
03 Mar 2014

CrystEngComm, 2014,16, 5012-5020
Article type
Paper

Variation of CO2 adsorption in isostructural Cd(II)/Co(II) based MOFs by anion modulation

U. P. Singh, S. Narang, P. Pachfule and R. Banerjee, CrystEngComm, 2014, 16, 5012
DOI: 10.1039/C4CE00058G

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