Synthesis, characterization and crystal structures of 2D Co(II)/Zn(II)-coordination polymers containing 3-(pyridin-4-yl)-5-(pyrazin-2-yl)-1H-1,2,4-triazole and benzenetetracarboxylate co-ligands

•Two isomorphic Co(II)/Zn(II) complexes with the mixed-ligands are synthesized.•Domain antiferromagnetic interactions exist in Co(II) complex.•The magnetization versus field and FC/ZFC curve have been studied.•Paramagnetic behavior in Co(II) complex can be observed.•The fluorescent property of Zn(II) complex has been investigated in the solid state.

Under solvothermal condition, the reaction of Co(II) or Zn(II) acetate with mixed-ligands 3-(pyridin-4-yl)-5-(pyrazin-2-yl)-1H-1,2,4-triazole (Hppt) and 1,2,4,5-benzenetetracarboxylate (H4btec) affords two isomorphic compounds [M(btec)0.5(Hppt)]n (M = Co(II) (1), Zn(II) (2)), which display the same dinodal (4,4)-connected 2D net. In addition to single-crystal X-ray crystallography, the complexes are also characterized by IR spectroscopy, PXRD, thermogravimetry, and elemental analysis. Magnetic susceptibility measurements indicate that domain antiferromagnetic interaction exists between Co(II) ions, and the paramagnetic behavior in 1 can be observed. The fluorescent property of 2 has been investigated in the solid state at room temperature.

Graphical abstractUnder solvothermal condition, the reaction of Co(II) or Zn(II) acetate with mixed-ligands 3-(pyridin-4-yl)-5-(pyrazin-2-yl)-1H-1,2,4-triazole (Hppt) and 1,2,4,5-benzenetetracarboxylate (H4btec) affords two isomorphic 2D net compounds.Figure optionsDownload full-size imageDownload as PowerPoint slide