Crystal structure of "[Li(Et₂O)]₄[FePh₄]": Corrigendum and reformulation. A remarkable example of a false solution in a wrong space group

The crystal structure of the supposed tetraphenylferrate(0) salt "[Li(Et₂O)]₄[FePh₄]" reported by Shilov et al. has been reinterpreted, and the unprecedented "flat rectangular" coordination geometry is proposed to be an artifact of a false solution in an incorrect space group. In the correct space group, the phenyl groups actually describe a regular square-planar geometry with cis C-Fe-C angles that are exactly 90°. In addition, the formulation of the compound as a derivative of zerovalent iron is almost certainly incorrect: we propose that the compound actually is an iron-(H) dihydride of stoichiometry [Li(Et₂O)]₄[trans-FeH₂-Ph₄].