Photocatalytic Properties And Electronic Effects Of Incorporation Bis(Acetylacetonato) Ruthenium(Ii/Iii) Complexes With Bidentate Nitrogen And Sulfur Ancillaries

Treatment of cis-[Ru(acac)(2)(CH3CN)(2)] (acac(-)=acetylacetonate) with 1.5 equiv. of corresponding bidentate nitrogen and sulfur ligands in ethanol gave a series of bis(acetylacetonato) ruthenium(II/III) complexes [(acac)(2)Ru(dimbpy)](PF6) (dimbpy=4,4 '-dimethyl-2,2 '-bipyridine) (1), [(acac)(2)Ru(phen)] (phen=o-phenanthroline) (2), [(acac)(2)Ru(opd)] (opd=o-phenylenediamine) (3), [(acac)(2)Ru(4-Bropd)] (4-Bropd=4-bromo-o-phenylenediamine) (4) and [(acac)(2)Ru(S2CNMe2)] (5), respectively. Complexes 1-5 were characterized by FT-IR, NMR and UV-Vis spectroscopies along with their electrochemical properties. The structures of complexes 1-5 have been unambiguously established by single crystal X-ray crystallography. The photocatalytic properties for hydrogen production by water splitting of complexes 1-5 under visible light (lambda>420 nm) were also investigated in the paper.