Surface Photovoltage Measurements on a Particle Tandem Photocatalyst for Overall Water Splitting.

Surface photovoltage spectroscopy (SPS) is used to measure the photopotential across a Ru-SrTiO:Rh/BiVO particle tandem overall water splitting photocatalyst. The tandem is synthesized from Ru-modified SrTiO:Rh nanocrystals and BiVO microcrystals by electrostatic assembly followed by thermal annealing. It splits water into H and O with an apparent quantum efficiency of 1.

Metal-metal bonding in low-coordinate dicobalt complexes supported by phosphinoamide ligands.

Homobimetallic dicobalt complexes featuring metal centers in different coordination environments have been synthesized, and their multielectron redox chemistry has been investigated. Treatment of CoX(2) with MesNKP(i)Pr(2) leads to self-assembly of [(THF)Co(MesNP(i)Pr(2))(2)(μ-X)CoX] [X = Cl (1), I (2)], with one Co center bound to two amide donors and the other bound to two phosphine donors. Upon two-electron reduction, a ligand rearrangement occurs to generate the symmetric species (PMe(3))Co(MesNP(i)Pr(2))(2)Co(PMe(3)) (3), where each Co has an identical mixed P/N donor set.