A new three-dimensional cobalt(II) coordination polymer based on biphenyl-2,2′,6,6′-tetracarboxylic acid and 1,2,4-triazole: Synthesis, crystal structure and magnetic properties

A new three-dimensional coordination polymer with the formula [Co(bta)0.5(Htz)(H2O)]n (1) (H4bta = biphenyl-2,2′,6,6′-tetracarboxylic acid and Htz = 1,2,4-triazole), has been hydrothermally synthesized and structurally characterized. The structure of can be considered as two-dimensional [Co(bta)(H2O)]n layers, consisting of one-dimensional [Co(COO)]n chains, which are separated by bta ligands, and neutral Htz pillars. The variable temperature magnetic property study indicates that there is a weak antiferromagnetic coupling interaction between Co(II) ions, which mainly arises from the antiferromagnetic coupling interaction in the one-dimensional [Co(COO)]n chains through syn–anti carboxylate bridges.