A Bisamide Ruthenium Polypyridyl Complex as a Robust and Efficient Photosensitizer for Hydrogen Production. Issue 22 (16th October 2017) - Schott, Olivier
Abstract: A photosensitizer based on a ruthenium complex of a bisamide‐polypyridyl ligand gives rise to a large improvement in photocatalytic stability, rate of activity, and efficiency in photocatalytic H2 production compared to [Ru(bpy)3 ] 2+ (bpy=2, 2′‐bpyridine). The bisamide ruthenium polypyridyl complex combined with a cobaltoxime‐based photocatalyst was found to be highly efficient under blue‐light (turnover number (TON)=7800) and green‐light irradiation (TON=7200) whereas [Ru(bpy)3 ] 2+ was significantly less effective with a TON of 2600 and 1100, respectively. The greatest improvement was under red‐light‐emitting diodes, with bisamide ruthenium polypyridyl complex and cobaltoxime exhibiting a TON of 4200 compared to [Ru(bpy)3 ] 2+ and cobaltoxime at a TON of only 71. Abstract : Fast and stable : A heteroleptic bisamide Ru photocatalyst based on [Co(dmgH)2 (DMAP)Cl] (dmgH=dimethylglyoxime, DMAP=4‐dimethylaminopyridine) is studied and compared to [Ru(bpy)3 ] 2+ (bpy=2, 2′‐bpyridine) for light‐driven hydrogen evolution under blue, green, and red light‐emitting diodes. Herein, we describe the most productive system to date under red‐light irradiation.