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Structural diversity, gas adsorption and magnetic properties of three coordination polymers based on a rigid multicarboxylate ligand

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Abstract

Three Co(II) coordination polymers (CPs), {[Co2(HL)(1,4-bibb)(H2O)]·(CH3CN)·(H2O)}n (1), {[Co4(L)(OH)3(H2O)4]·(1,4-bmib)}n (2) and {[Co6(L)2(OH)2(4,4-biyb)]·(CH3CN)·(H2O)}n (3) have been obtained based on a V-shaped rigid pentacarboxylate ligand (H5L = 3,5-di(2′,5′-dicarboxylphenyl)benzoic acid) and different N-donor ligands. All complexes show 3D structures and contain open carboxyl sites and “accessible metal sites” (AMSs). The gas adsorption experiments show that 1 and 3 have a high H2 adsorption capacity at 77 K and in particular, 3 displays the selective uptake of CO2 over CH4 (14.2 for CO2/CH4 = 0.5/0.5 and 11.0 for CO2/CH4 = 0.05/0.95 under 1 bar at 298 K). Furthermore, anti-ferromagnetic interactions among Co(II) ions are observed in 2.

Graphical abstract: Structural diversity, gas adsorption and magnetic properties of three coordination polymers based on a rigid multicarboxylate ligand

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Article information


Submitted
17 Aug 2020
Accepted
24 Sep 2020
First published
24 Sep 2020

CrystEngComm, 2020, Advance Article
Article type
Paper

Structural diversity, gas adsorption and magnetic properties of three coordination polymers based on a rigid multicarboxylate ligand

L. Gao, Y. Bian, Y. Tian, Y. Chen and T. Hu, CrystEngComm, 2020, Advance Article , DOI: 10.1039/D0CE01201G

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