Abstract
Abstract We have reviewed several time-resolved electron paramagnetic resonance (TREPR) studies focusing on influences of nitroxide radicals on the photophysical properties of metalloporphyrins and metallophthalocyanines, which are coordinated or linked to nitroxide radicals. This paper summarizes TREPR studies on the excited multiplet states of metalloporphyrins and metallophthalocyanines coordinated by several kinds of nitroxide radicals, where the excited doublet and quartet states generated by the interaction between the excited triplet chromophore and doublet radical have been analyzed in detail. Selective population from the excited multiplet states to the triplet ground state is also discussed for phthalocyaninatosilicon covalently linked to two TEMPO radicals in terms of a new concept for controlling magnetic properties by photoexcitation.
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