Covalently Attached Porphycene–Ferrocene Dyads: Synthesis, Redox-Switched Emission, and Observation of the Charge-Separated State

Two new porphycenes
functionalized with ferrocenyl pendants have been synthesized and
characterized spectroscopically and structurally. The porphycene-based
emission in porphycene–ferrocene dyads was switched on and
off by the reversible control of the ferrocenyl pendant redox states.
Transient absorption spectroscopy with a femtosecond laser-pulsed
technique has successfully detected the picosecond charge-separated
excited state of the dyad upon Q-band excitation of the porphycene
ring.