An integrated Re() photocatalyst/sensitizer that activates the formation of formic acid from reduction of CO

The complex cis -[Re(bpy) 2 (CO) 2 ] + OTf ( 1 + OTf ) is an integrated photosensitizer/catalyst for the selective visible light promoted photocatalytic reduction of CO 2 . The formation of formic acid is unique among this class of Re catalysts, which yield CO as the selective product. A supplemental photosensitizer, Ru(bpy) 3 2+ , considerably enhanced the performance of this catalyst. cis -[Re(bpy) 2 (CO) 2 ] + OTf is a new integrated photosensitizer/catalyst for the selective visible light promoted photocatalytic reduction of CO 2 to yield formic acid.