Crystal structure of poly[[di-aqua-tetra-μ 2 -cyanido-platinum(II)iron(II)] methanol 4/3-solvate]: a three-dimensional Hofmann clathrate analogue.

In the title polymeric coordination compound, {[FePt(CN) 4 (H 2 O) 2 ]·1.33CH 3 OH} 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 mol-ecules, forming a nearly regular [FeN 4 O 2 ] octa-hedron. 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 FeN 4 plane, thus ensuring the creation of a three-dimensional framework. The crystal structure features methanol solvent mol-ecules of which 4/3 were located per Fe II cation. These solvent mol-ecules are located in hexa-gonal pores; they inter-act with coordinating water mol-ecules through weak hydrogen bonds. Other guest mol-ecules could not be modelled in a satisfactory way and their contribution to the scattering was removed by a mask procedure.