Inorganic hybrid open-framework structures: synthesis and structure of a cobalt phosphate-oxalate,[C₄N₂H₁₂]_0.5[Co₂(HPO₄)(C₂O₄)_1.5]

Abstract

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, β=97.7(1)°; V=1024.2(2) ų; space group=P2₁/c (no. 14); Z=4; M=389.9; D_calc.=2.529 g cm^-3; λ(Mo-K_α)=3.451 mm^-1; λ=0.71073 Å; R₁=0.04; wR₂=0.10 and S=1.13.