A new 3D Co(II)–organic framework with acylamide-containing tetracarboxylate ligand: Solvothermal synthesis, crystal structure, gas adsorption and magnetic property

•A new 3D Co(II)–organic framework with nanosized acylamide-containing tetracarboxylate ligand has been solvothermally synthesized and characterized.•Complex 1 exhibits a uninodal (4,4)-connected crb topology.•The thermal stability, gas adsorption and magnetic property were studied.

A new cobalt(II)–organic framework, [Co2(L)(py)2(DMSO)]n•0.5nDMF•2nDMSO (1) [H4L=5,5׳-((naphthalene-2,6-dicarbonyl)bis(azanediyl))diisophthalic acid, py=pyridine, DMSO=dimethyl sulfoxide, DMF=N,N-dimethylformamide], has been solvothermally synthesized and characterized by elemental analysis, IR, TGA, PXRD and single-crystal X-ray crystallography. The structural analysis reveals that complex 1 is a 3D framework built from nanosized acylamide-containing tetracarboxylate ligands (L4−) and dinuclear [Co2(CO2)4] secondary building units (SBUs), exhibiting a uninodal (4,4)-connected crb topology with the Schläfli symbol of (4•65). The desolvated complex (1a) displays higher adsorption capability for CO2 than N2, which may be due to the relatively strong binding affinity between the CO2 molecules and acylamide groups in the framework. The magnetic investigation shows that the dominant antiferromagnetic interaction is observed in complex 1.

Graphical abstractA new 3D Co(II)–organic framework with nanosized acylamide-containing tetracarboxylate ligand was solvothermally synthesized and structurally characterized, its thermal stability, gas adsorption and magnetic property were studied.Figure optionsDownload full-size imageDownload as PowerPoint slide