Issue 2, 2015

Syntheses, structures and gas sorption properties of two coordination polymers with a unique type of supramolecular isomerism

Abstract

The solvothermal reaction of a short bridging ligand 1H-pyrazole-4-carboxylic acid (H2pc) and Zn(NO3)2 in a mixed solvent containing N,N-dimethylacetamide (DMA) at 110 °C produced two genuine supramolecular isomers [Zn2(pc)2(DMA)] (1) and [Zn2(pc)2]·DMA (2). Single-crystal X-ray diffraction studies showed that 1 is a densely packed layered structure with DMA molecules coordinated on the layered surface, and 2 is a porous three-dimensional framework structure with DMA molecules filled inside the pore without coordination to any metal ion, which represents a rare case of coordination-sphere isomerism in coordination polymers. Removal of the coordinated DMA molecules in 1 occurs at high temperatures, accompanying the irreversible formation of an unidentified nonporous phase. On the other hand, the guest DMA molecules in 2 can be readily removed under mild conditions to give a new porous phase [Zn2(pc)2] (2′). Gas-sorption measurements of 2′ revealed that the framework has significant flexibility and selective CO2 adsorption at room temperature.

Graphical abstract: Syntheses, structures and gas sorption properties of two coordination polymers with a unique type of supramolecular isomerism

Supplementary files

Article information

Article type
Research Article
Submitted
30 10 2014
Accepted
04 12 2014
First published
05 12 2014

Inorg. Chem. Front., 2015,2, 136-140

Author version available

Syntheses, structures and gas sorption properties of two coordination polymers with a unique type of supramolecular isomerism

X. Qi, J. Ye, R. Lin, P. Liao, S. Liu, C. He, J. Zhang and X. Chen, Inorg. Chem. Front., 2015, 2, 136 DOI: 10.1039/C4QI00190G

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