Crystal structure of bis-(tetra-phenyl-phospho-nium) bis-(cyanido-κC)(29H,31H-tetra-benzo[b,g,l,q]porphinato-κ(4) N (29),N (30),N (31),N (32))ferrate(II) acetone disolvate.

Abstract

The crystal structure of the title compound, (C24H20P)2[Fe(C36H20N4)(CN)2]·2C3H6O, is constructed from a tetra­hedral Ph4P+ (tetra­phenyl­phospho­nium) cation, one [Fe(tbp)(CN)2]2− anion (tbp = tetra­benzoporphyrin in its doubly deprotonated form), located on a centre of inversion, and an acetone mol­ecule as crystallization solvent. Since the mol­ecular 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 Fe2+ 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 octa­hedral configuration. The packing is stabilized by C—H⋯N inter­actions between the Ph4P+ cation and the CN− ligand of the [Fe(tbp)(CN)2]2− anion, and by C—H⋯π inter­actions between the Ph4P+ cation, acetone solvent mol­ecules and the [Fe(tbp)(CN)2]2− anion.