Electronic structures of highly deformed iron(III) porphyrin complexes

This review describes the effects of highly deformed porphyrin ring on the electronic structures of iron(III) porphyrinates, which includes (i) the electron configurations in low-spin (S = 1/2) ruffled complexes, (ii) the contribution of the intermediate-spin (S = 3/2) state in the spin-admixed (S = 5/2, 3/2) complexes with ruffled and saddled porphyrin ring, and (iii) the novel spin crossover (S = 1/2, S = 3/2) phenomenon in saddled complexes, with a special emphasis on the use of 1H NMR, 13C NMR, and EPR spectroscopy.