Photoinduced Electron Transfer in Covalently Linked Oxomolybdenum(V) Porphyrin Systems.

Transient resonance Raman, fluorescence emission, and transient absorption spectroscopies show that photoinduced electron transfer occurs in the covalently linked porphyrin−Mo dyads ZnTTP(2,3-MoVO(pzb)) and ZnTTP(3,4-MoVO(pzb)). These compounds represent first generation models for observing real-time electron transfer dynamics in pterin-containing molybdenum enzymes. The results indicate that deactivation of the S1 state of the porphyrin occurs solely by electron transfer to Mo(V), with a quantum efficiency for the forward electron transfer process approaching unity.