In the title coordination polymer, [Ni(C8H4O4)(C4H10N2)]n, the Ni(II) atom is situated on a C2 axis and is six-coordinated by two N atoms from two piperazine (pip) molecules, four O atoms from two bidentate and chelating terephthalate (tp) anions, forming a distorted octahedron. Both pip and tp molecules, which are centrosymmetric, bridge adjacent Ni(II) atoms, forming a three-dimensional network.
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Carton et al. (2007) studied this question.