PORPHYRIN ANION RADICALS DETECTED BY CIDNP TECHNIQUE. FIRST OBSERVATION OF CIDNP SIGNALS DUE TO PORPHYRIN IN THE PHOTOREACTION BETWEEN PORPHYRIN AND PHENOLS
Photo-CIDNP signals due to porphyrin were observed for the first time in the photoreaction of porphyrin and phenols in benzene. The intensities of CIDNP signals increased in proportion to the oxidation potential of phenol compounds. Relative magnitude of hyperfine coupling constants of porphyrin anion radicals is discussed.