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)](2)Cl-2 or [Fe(TPP)(4-MeHIm) (2)][K( 222-cryptand)](2)Cl-2, 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) angstrom and the Fe - N-Im distance is 2.0154 (8) angstrom. The porphyrin core is saddled; the two imidazole rings have a relative parallel orientation (N-p = porphyrinate N atom and Im = imidazole).