New porous Co(II)-based metal-organic framework including 1D ferromagnetic chains with highly selective gas adsorption and slow magnetic relaxation.

A new porous metal-organic framework, namely [Co 3 (L)(OH) 2 (H 2 O) 4 ]·NMP·3H 2 O (1), has been yielded by using Co(II) and rigid V-shaped 2,6-di(2′,5′-dicarboxylphenyl)pyridine (H 4 L). The structure analysis revealed that MOF 1 is a three-dimensional (3D) porous framework with 1D [Co 3 (OH) 2 ] n ferromagnetic chains. The gas sorption measurements and the IAST analysis indicated MOF 1 has a relatively high selectivity for C 2 H 6 and CO 2 over CH 4. The magnetic properties indicated that MOF 1 has the ferrimagnetic and slow magnetic relaxation behavior, giving an interesting single-chain magnet behavior with an effective energy barrier of 15.82 K. A new 3D porous MOF 1 has been successfully synthesized. Gas sorption tests showed that MOF 1 has a relatively high adsorption capacity and selectivity for C 2 H 6 and CO 2 over CH 4. And also, MOF 1 displays the ferrimagnetic and slow magnetic relaxation behavior, giving an interesting single-chain magnet with an effective energy barrier of 15.82 K. Image 1 • The rigid V-shaped nitrogen heterocyclic carboxylic acid ligand 2,6-di(2′,5′-dicarboxylphenyl)pyridine(H 4 L) and Co(II) ions was selected as the building units to build porous crystalline MOF. • Structure analysis revealed that MOF 1 is a three-dimensional (3D) porous framework with 1D [Co 3 (OH) 2 ] n ferromagnetic chains. • Gas sorption measurements and the IAST analysis showed that MOF 1 has the higher adsorption selectivity for C 2 H 6 and CO 2 over CH 4. • Magnetic properties indicated that MOF 1 has the ferrimagnetic and slow magnetic relaxation behavior. [ABSTRACT FROM AUTHOR]