Dirhodium Complexes as Panchromatic Sensitizers, Electrocatalysts, and Photocatalysts.

Dinuclear rhodium complexes are attractive candidates as homogeneous panchromatic photosensitizers and photocatalysts. Modification of the coordination sphere of the Rh2 (II,II) compounds results in photophysical and redox properties that are highly desirable for electro- and photocatalysis. Specifically, Rh2 (II,II) complexes have shown promising catalytic activity towards proton reduction to generate H2 , a clean fuel, and for the selective reduction of CO2 to HCOOH. In addition, paddlewheel Rh2 (II,II) complexes provide robust platforms for the design of efficient and stable single-component photocatalysts. Optimization of the Rh2 (II,II) catalysts is crucial to realize their future application in devices or systems designed for the production of fuels from sunlight.