Photocatalytic reduction of CO2 using cis,trans-[Re(dmbpy)(CO)2(PR3)(PR’3)]+ (dmbpy=4,4′-dimethyl-2,2′-bipyridine)

Photocatalysis of biscarbonylrhenium complexes cis,trans-[Re(dmbpy)(CO)2(PR3) (PR′3)]+ (dmbpy=4,4′-dimethyl-2,2′-bipyridine: R, R′=Ph (1a+); p-FPh (1b+); R=Ph, R′=OEt (1c+); R, R′=O-i-Pr (1d+)) is reported for the first time. The rhenium complexes with two triarylphosphine ligands (1a+, 1b+) efficiently photocatalyzed CO2 reduction with triethanolamine as a sacrificial donor. On the other hand, the complexes with one or two trialkylphosphite ligand(s) (1c+, 1d+) had low photocatalytic abilities under the same reaction conditions.

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