A cytochrome b model, [Fe(TPP)(4-MeHIm)₂][K(222-cryptand)]₂Cl₂

The mol­ecular structure of the title cytochrome b model, (5-meth­yl-4H-imidazole)(5,10,15,20-tetra­phenyl­porphyrinato)­iron(II) bis­[(222-cryptand)potassium(I)] dichloride, [Fe(C₄₄H₂₈N₈)(C₄H₆N₂)₂][K(C₁₈H₃₆N₂O₆)]₂Cl₂ or [Fe(TPP)(4-MeHIm)₂][K(222-cryptand)]₂Cl₂, is reported. This low-spin Fe^II tetra­phenyl­porphyrinate is cocrystallized with the salt [K(222-cryptand)]Cl. The crystal structure has iron(II) on an inversion center. The average Fe-N_p bond is 1.9952 (8) Å and the Fe-N_Im distance is 2.0154 (8) Å. The porphyrin core is saddled; the two imidazole rings have a relative parallel orientation (N_p = porphyrinate N atom and Im = imidazole).