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The crystal structure of the title compound, (C24H20P)2[Fe(C36H20N4)(CN)2]·2C3H6O, is constructed from a tetra-hedral Ph4P(+) (tetra-phenyl-phospho-nium) cation, one [Fe(tbp)(CN)2](2-) anion (tbp = tetra-benzoporphyrin in its doubly deprotonated form), located on a centre of inversion, and an acetone mol-ecule as crystallization solvent. Since the mol-ecular structure of the M(tbp) moiety is insensitive to the kind of metal ion and its oxidation state, bond lengths and angles in the [Fe(tbp)(CN)2](2-) anion are similar to those in other M(tbp) compounds. The Fe(2+) ion, located on a centre of inversion, is coordinated by four N atoms of tpb in the equatorial plane and by two C atoms of the cyanide anion at axial positions in a slightly distorted octa-hedral configuration. The packing is stabilized by C-H⋯N inter-actions between the Ph4P(+) cation and the CN(-) ligand of the [Fe(tbp)(CN)2](2-) anion, and by C-H⋯π inter-actions between the Ph4P(+) cation, acetone solvent mol-ecules and the [Fe(tbp)(CN)2](2-) anion.

acta crystallographica. section e, crystallographic communications

Crystal structure of bis(tetraphenylphosphonium) bis(cyanido-κC)(29H,31H-tetrabenzo[b,g,l,q]porphinato-κ4N29,N30,N31,N32)ferrate(II) acetone disolvate