Oppositely charged zinc and copper porphyrins form ion-paired dimers which show biphasic decay of flash transients in fluid solution. In a glass at low temperature, two photoexcited components are also seen by time-resolved EPR. On the basis of lifetime, absorption spectrum, oxygen sensitivity and EPR spectrum, the long-lived transient is assigned to the zinc porphyrin triplet. The short-lived species is attributed to an ion radical-pair formed by electron transfer from an excited singlet precursor.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry