Acta Cryst. (2005). E61, m1201-m1203  [ doi:10.1107/S1600536805015989 ]

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

N. J. Silvernail, B. C. Noll and W. R. Scheidt

Abstract: 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).

Online 28 May 2005

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