Inorganic Hybrid Open-Framework Structures: Synthesis and Structure of a Cobalt Phosphate-Oxalate [C₄N₂H₁₂]₀.₅[Co₂(HPO₄)(C₂O₄)₁.₅]

A new open-framework inorganic-organic hybrid structure involving cobalt, [N2C4H12]0.5[CO2(HPO4)(C2O4)1.5], has been synthesized for the first time by hydrothermal methods. The three-dimensional structure is formed by the edge-shared CoO6 and CoO5 polyhedra forming a [Co2O9] dimer, that are connected with the PO4 polyhedra and the oxalate units forming one-dimensional channels. The amine molecules are located within these channels. The oxalate units have a dual functionality of connecting within the plane of the layer as well as out of the plane. The material is thermally stable up to 350°C and orders anti-ferromagnetically at low temperatures. Crystal data: a = 7.494(1), b = 7.726(1), c = 17.852(3) Å, ?. =. 97.7(1)°; V. =. 1024.2(2) Å3; space group =. P21/c (no. 14); Z. =. 4; M. =. 389.9; D(calc.) =. 2.529 g. cm-3; ?(Mo-K(?)) =. 3.451 mm-1; ?. =. 0.71073 A; R1 =. 0.04; wR2 =. 0.10 and S = 1.13