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

A new cobalt(II)-organic framework, [Co-2(L)(py)(2)(DMSO)](n)center dot 0.5nDMF center dot 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 [Co-2(CO2)(4)] secondary building units (SBUs), exhibiting a uninodal (4,4)-connected crb topology with the Schlafli symbol of (4.6(5)). The desolvated complex (1a) displays higher adsorption capability for CO2 than N-2, 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. (C) 2014 Elsevier Inc. All rights reserved.