Redetermination of cyclo-tetrakis(μ-5,10,15,20-tetra-4- pyridylporphyrinato)tetrazinc(II) dimethylformamide octasolvate trihydrate at 100 K

Abstract

The structure of the title compound, [Zn4(C40H 24N8)4]·-8C3H 7NO·3H2O, has been redetermined at 100 K. The redetermination is of significantly higher precision and gives further insight into the disorder of pyridyl groups and solvent molecules. The molecules of (5,10,15,20-tetra-4-pyridyl-porphyrinato)zinc(II) (ZnTPyP) form homomolecular cyclic tetramers by coordination of a peripheral pyridyl group to the central Zn atom of an adjacent symmetry-related molecule. The tetra-mer so formed exhibits molecular S4 symmetry and is located about a crystallographic fourfold rotoinversion axis. Severely disordered dimethylformamide and water molecules are present in the crystal, the contributions of which were omitted from refinement. Intermolecular C -H⋯N hydrogen bonding is observed.