Photochemical Reduction of CO2 with Red Light Using Synthetic Chlorophyll–Rhenium Bipyridine Dyad

We successfully performed the reduction of CO2 to CO by selective illumination of red visible light to a chlorophyll derivative covalently linked with a rhenium bipyridine complex. This is the first example of the photochemical reduction of CO2 using a sensitizer that has strong absorption at a wavelength over 650 nm.