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.
(© Hiiuk et al. 2022.)