Characterization of the mixed axial ligand complex (4-cyanopyridine)(imidazole)(tetramesitylporphinato)iron(iii) perchlorate. Stabilization by synergic bonding.

The reaction of [Fe(TMP)(OClO)], where TMP is the dianion of tetramesitylporphyrin, with a combination of a strong -acceptor ligand and a -donating imidazole can lead to the preparation of mixed-ligand complexes [Fe(Porph)(4-CNPy)(L)] where L is imidazole itself or 1-acetylimidazole and 4-cyanopyridine is the strong acceptor ligand. The stability of the new mixed-ligand pair is the presumed result of synergic bonding between the two axial ligands. The molecular structure and other characterization of the new mixed axial ligand complex, [Fe(TMP)(4-CNPy)(HIm)]ClO is described.

Characterization of the Bis(azido)(meso-tetraphenylporphinato)ferrate(III) Anion. An Unusual Spin-Equilibrium System.

The complex anion bis(azido)(tetraphenylporphinato)ferrate(III) has been synthesized and characterized by variable-temperature X-ray structure determinations, powder and single-crystal EPR, IR, and Mössbauer spectroscopy, and magnetic susceptibility measurements. The synthesis utilizes 18-crown-6 to solubilize sodium azide in the synthetic procedure. All physical data for [Na(18C6)(H(2)O)(2)][Fe(TPP)(N(3))(2)].