Ruthenium complexes oxygen ligands

Oxygen Bimolecular Quenching Constant fora Metal-Ligand Complex The complex of ruthenium with three diphenylphenanthrolines, [Ru(dpp)3], displays a Imig lifetime of about 5 is and has found widespread use as an... 

Ruthenium(III), d, is ruthenium s most stable oxidation state and resembles rhodium(III) and iridium(III) more than osmium(III). The salts inelude the halides, hydroxides, and oxides RuCls SHaO is most important because it is a good starting material for other compounds and reacts readily with olefins and phosphines. Complexes of this oxidation state are known with water, eyanide, oxygenated organies, sueh as diketones and earboxylates, pyridines, earbonyls, ey-elopentadienyls, phosphine, and arsine ligands. A notable differenee between ruthenium(II) and ruthenium(III) is the absenee of ruthenium(III) nitrosyl complexes. 

Ligand effects appear to be important, the yield of acetophenone increasing in the order I < Br < Cl , although the amounts of this product are much reduced if SnCU or HgCl is bonded to the iridium. In the former case, a strong trans effect may promote formation of an iridium-styrene-oxygen intermediate. Ruthenium-oxygen complexes have also been shown to be... 

Another stndy on binding to NHC complexes, that combined experiments and DFT (density functional theory) calculations was recently reported on a ruthenium system. This study shows the reversible binding of oxygen to the tetra-NHC complex [Ru(NHC) H)][BAr/] 6 (BAr/ = B (3,5-CF3) C H3 ), which leads to complex 7 (Scheme 10.2) [12]. Unexpectedly, the chemical shift of the hydride ligand undergoes a large downfield shift upon coordination to (from -41.2 ppm... 

It has been known for many years that ruthenium(II) complexes of non-macrocyclic ligands photogenerate singlet oxygen. Thus, in 1973 it was observed for [Run(phen)2(CN)2] that singlet... 

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