Efficient Activation of the Greenhouse Gas CO 2

CO 2 , can do : Recently, two groups independently described elegant ways for the direct two‐electron reduction of CO 2 to CO, bypassing the formation of the CO 2 .− radical (see scheme). Armstrong et al. used a photoactive Ru complex and the CO 2 ‐reducing enzyme CODH I immobilized on TiO 2 nanoparticles. Cummins et al. exploited a Nb V nitrido complex in which the nitrido ligand reacts with CO 2 to give a carbamate species.