[Fe(TPP)(4-MePip)(2)]: an axially compressed bis(secondary amine) complex of an iron(II) porphyrin.

The low-spin iron(II) ion of bis(4-methylpiperidine)(5,10,15,20-tetraphenylporphyrinato)iron(II), [Fe(TPP)(4-MePip)(2)], where TPP is 5,10,15,20-tetraphenylporphyrinate (C(44)H(28)N(4)) and 4-MePip is 4-methylpiperidine (C(6)H(13)N), is located at a center of inversion, and there is one molecule in the triclinic unit cell. The axial 4-MePip ligands adopt a chair conformation and the alpha-C atoms are oriented at angles of 21.2 (2) and 32.8 (2) degrees relative to the closest porphyrin N atoms. The equatorial Fe-N(TPP) distances are 1.998 (2) and 1.990 (2) A, while the axial Fe-N distance is 2.107 (2) A. The relatively short axial coordination distance reflects compression of the molecule along its principal axis by intermolecular non-bonded interactions.