Phenoxazine‐Sensitized CO₂‐to‐CO Reduction with an Iron Porphyrin Catalyst: A Redox Properties‐Catalytic Performance Study

Abstract We have evaluated six phenoxazine derivatives as visible light photosensitizers for the photochemical reduction of CO 2 to with an iron porphyrin catalyst in organic media. The core was functionalized electron‐donating or ‐withdrawing groups modify photophysical properties. Both singlet and triplet excited state potentials sensitizers spanned several hundred mV range ground oxidation 250 mV. observed that no correlation can be established between production potential phenoxazine, which determines driving force electron transfer catalyst. On contrary, a clear made CO. This observation indicates process limited by photosensitizer regeneration highlights fact transfers not directly related activation could play key role homogeneous photocatalytic systems.