Electronic States and Magnetic Properties of Triplet Porphyrinato Copper(II) Cation Radical Complexes

The porphyrinato copper cation radical complexes were examined by EPR spectroscopy. The cation radical complexes having bulky peripheral substituents are present as monomers in fluid solution and show EPR spectra due to intramolecular spin coupling between the spins on copper and on the porphyrin ring. The cation radical complexes, having no such substituents, form a dimer in solution. On the other hand, when they are oxidized in frozen solution...