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In the title compound, [Co(C 8 H 5 O 4 )(C 9 H 6 N 7 )]  n  , the divalent Co II atom is six-coordinated to three N atoms from two symmetrical 5-(pyridin-4-yl)-1 H ,2' H -3,3'-bi[1,2,4-triazole] (H 2 pyttz) ligands and three O atoms from three symmetrical 3-carb-oxy-benzoate (Hbdic) ligands, leading to a distorted {CoN 3 O 3 } octa-hedral coordination environment. Two Co II cations are linked by four bridging carboxyl-ate groups to generate a dinuclear [Co 2 (CO 2 ) 4 ] unit. The dinuclear units are further connected into a chain along [010] via the Hbdic ligands. The other infinite chain, along [100], is formed through the H 2 pyttz ligands. Finally, the two kinds of chains are cross-linked, by sharing the Co II cations, into a two-dimensional network. In the crystal, adjacent layers are further linked by O-H⋯N hydrogen bonds into a three-dimensional framework.

acta crystallographica section e crystallographic communications

Synthesis and crystal structure of a two-dimensional CoIIcoordination polymer: poly[(μ3-3-carboxybenzoato)[μ2-5-(pyridin-4-yl)-1H,2′H-3,3′-bi[1,2,4-triazole]]cobalt(II)]