Two new isotypic Co(II)/Ni(II)-coordination polymers based on 5-(6-Carboxypyridin-2-yl)isophthalic acid: Synthesis, structure analysis and magnetism properties

•An N-donor ligand, Co(II) and Ni(II) ions were chosen as the building blocks to synthesize the CPs.•Two isotypic CPs with 2D layer structure have been synthesized via the solvothermal reactions.•Magnetic explorations show the antiferromagnetic interactions between metal ions Two new two-dimensional (2D) metal-organic frameworks (MOFs), named [Co3(L)2(H2O)4] (1) and [Ni3(L)2(H2O)4] (2) [H3L = 5-(6-Carboxypyridin-2-yl)isophthalic acid], have been solvothermally synthesized under different solvent systems, which have been well characterized by elemental analysis, FT-IR spectrum, powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction shows that 1 and 2 are isomorphic structures, giving a 2D layer structure based on the trinuclear secondary building units (SBU). Topology analyses reveal that 1 and 2 can be simplified as a binodal (3, 6)-connected kgd topological net with the point symbol (43)(46·66·83). The magnetic properties for 1 and 2 have been systemically explored, which shows the antiferromagnetic interactions between metal ions in the solid state. Two new two-dimensional (2D) coordination polymers (CPs): [Co3(L)2(H2O)4] (1) and [Ni3(L)2(H2O)4] (2) [H3L = 3-(3,5-dicarboxylphenyl)-5-carboxylpyridine], have been synthesized under different solvent systems. Structural analysis show that 1 and 2 are isomorphic structures, giving a 2D layer structure based on the tri-nuclear secondary building units (SBUs). The magnetic properties for 1 and 2 have been systemically explored, which show the antiferromagnetic interactions between metal ions in 1 and 2. [Display omitted]