The crystal structure of carbonatotetrakis(pyridine)cobalt(III) perchlorate monohydrate

Carbonatotetrakis(pyridine)cobalt(III) perchlorate monohydrate (CoC₂₁H₂₀N₄O₇Cl.H₂O) crystallizes in the space group P2₁/c (No. 14) with a = 9.457 (3), b = 16.333 (6) and c = 15.582 (11) Å, β = 97.93 (4)°, Z = 4. There is one formula unit in the asymmetric unit. The structure was solved by Patterson and Fourier techniques and refined by full-matrix least-squares methods to an R value of 0.049, using 3302 diffractometer-collected three-dimensional single-crystal X-ray intensity data. The cobalt atom is octahedrally surrounded by four nitrogen atoms of the pyridine molecules and two oxygen atoms of the bidentate carbonate group. The coordination octahedron is distorted due to strain in the four-membered chelate ring and steric hindrance between the pyridine molecules. The O—Co—O angle is 69.3°. There are no very short intermolecular distances, so the conformation is probably not very much affected by crystal packing.