Formation of manganese(II) porphyrin derivatives from manganese(III) derivatives by ionizing radiation
Abstract
Exposure of manganese(III) porphyrin solutions to 60Co γ-rays at 77 K gave the manganese(II) derivatives, with g⊥(apparent)≈ 6, A(55Mn)≈ 77 G and |D| 0.3 cm–1. The spectra are very similar to those for MnII derivatives prepared chemically. Weak features in the g= 2 region for these complexes were obscured by features from a symmetrical MnII derivative of unknown origin. These features grew in intensity on melting and re-freezing.
These results suggest that low-temperature irradiation coupled with e.s.r. spectroscopy may be a suitable technique for detecting MnIII derivatives in biological systems.