Crystal structure of poly[[di­aqua­tetra-μ2-cyanido-platinum(II)iron(II)] methanol 4/3-solvate]: a three-dimensional Hofmann clathrate analogue

In the title polymeric coordination compound, {[FePt(CN)₄(H₂O)₂]·1.33CH₃OH}_n, the Fe^II cation (site symmetry 4/mm.m) is coordinated by the N atoms of four cyanide anions (CN⁻) and the O atoms of two water mol­ecules, forming a nearly regular [FeN₄O₂] octa­hedron. According the Fe—N and Fe—O bond lengths, the Fe^II atom is in the high-spin state. The cyanide anions act in a bridging manner to connect the Fe^II and Pt^II atoms. The [Pt(CN)₄]^2– moieties (Pt with site symmetry 4/mm.m) have a perfect square-planar shape. The latter anion is located perpendicular to the FeN₄ plane, thus ensuring the creation of a three-dimensional framework. The crystal structure features methanol solvent mol­ecules of which 4/3 were located per Fe^II cation. These solvent mol­ecules are located in hexa­gonal pores; they inter­act with coordinating water mol­ecules through weak hydrogen bonds. Other guest mol­ecules could not be modelled in a satisfactory way and their contribution to the scattering was removed by a mask procedure.