T. Ikeue et al., Direct observation of conformers caused by the difference in ligand orientation in low spin iron(III) porphyrin complex, CHEM LETT, (4), 2000, pp. 342-343
EPR spectrum of low spin bis(dimethylaminopyridine)(3,8, 13,18-tetramesityl
-2,7,12,17-tetramethylporphyrinato)iron(III) perchlorate taken in frozen CH
2Cl2 solution at 4.2 K showed both large g(max) and rhombic type signals. T
he result has been explained in terms of the presence of two conformers whe
re the dihedral angles between two ligands are different.