Issue 8, 2018

Controlled flexibility of porous coordination polymers by shifting the position of the –CH3 group around coordination sites and their highly efficient gas separation

Abstract

As an emerging class of crystalline materials, porous coordination polymers (PCPs) with regular and flexible nanopores have become particularly promising for adsorption applications. Here, we report a new method to synthesize PCPs with varied flexibility by shifting the position of the methyl group, the shortest alkyl chain, around the coordination sites of T-shaped ligands of H2NL1 (5-(2′-methyl-imidazol-1-yl)-isophthalic acid) and H2NL2 (5-(4′-methyl- imidazol-1-yl)-isophthalic acid). The two generated PCPs (NTU-40 and NTU-41) showed a significant change in gate opening pressure (P/P0: 0.25 to 0.0001) under the stimulus of N2 at 77 K. In addition, the square window (5 × 5 Å2) of the one-dimensional (1D) zigzag channel was divided into two small triangular and straight channels in NTU-41. More importantly, the synergistic effect of structural flexibility, channel type and the micro-pores enabled highly efficient CO2/CH4 and C2H4/CH4 separation under both equilibrium state and dynamic conditions, as well as having good potential for challenging C2H4/C2H6 separation.

Graphical abstract: Controlled flexibility of porous coordination polymers by shifting the position of the –CH3 group around coordination sites and their highly efficient gas separation

Supplementary files

Article information

Article type
Research Article
Submitted
19 Bit 2018
Accepted
18 Elb 2018
First published
23 Elb 2018

Inorg. Chem. Front., 2018,5, 1780-1786

Controlled flexibility of porous coordination polymers by shifting the position of the –CH3 group around coordination sites and their highly efficient gas separation

J. Duan, Q. Zhang, S. Wang, B. Zhou, J. Sun and W. Jin, Inorg. Chem. Front., 2018, 5, 1780 DOI: 10.1039/C8QI00240A

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