EPR-spectroscopic Experiments with the Co-Salen/O2-Complex, VI: Differentiation of the Bound Oxygen

Article abstract of DOI:10.1002/ardp.19883211103

EPR-spectroscopic experiments of Co-Salen depending on solvent, substrate and oxygen are described.We explain the EPR-inactivity in acetonitrile with a Co-salen-dimer.Co-Salen, depending on the nature of the substrate, is able to activate oxygen into different species, which allow 1. (4+2)-cycloadditions very similar to the reactions with singlet oxygen in the case of 1,5-dihydroxy-naphthalene (1) and 2. radical-reactions with 2,6-di-t-butylphenol (4).These experiments are consistent with former chemiluminescence measurements.We describe an activation model of Co-salen/02 with the investigated reactions.