The application of high-performance liquid chromatography in the investigation of reactions involving ruthenium(II)bis(bipyridyl) compounds

Photostability, Electrochemistry, and Monolayers of [M(bpy)2(trans-1,2-bis(4-pyridyl)ethylene)L]+ (M = Ru, Os; L = Cl, H2O)

“…Previous investigations on related systems indicate that loss of chloride, rather than the monodentate pyridine ligand, is favored in water . In contrast, loss of the bpe ligand is expected following irradiation in organic solvents such as acetonitrile or acetone . As shown in Table , irradiation of the Ru-bpe complex in acetonitrile results in a product with a λ max of 481 nm, which is in good agreement with the literature value of 480 nm found for [Ru(bpy) 2 (CH 3 CN)Cl] + and indicates loss of bpe.…”

“…As shown in Table , irradiation of the Ru-bpe complex in acetonitrile results in a product with a λ max of 481 nm, which is in good agreement with the literature value of 480 nm found for [Ru(bpy) 2 (CH 3 CN)Cl] + and indicates loss of bpe. In aqueous acetone, irradiation produces a species with an absorption maximum of 512 nm, indicative of [Ru(bpy) 2 (solvent)Cl] + , where solvent is acetone or water 1 Absorption Maxima of the Ruthenium Complex Dissolved in Different Solvents with and without Light Exposure solventλ max (nm)/complex presentλ max (nm)/model complex a acetonitrile (sample kept in the dark) 493/[Ru(bpy) 2 (bpe)Cl] + 494/[Ru(bpy) 2 (py)Cl] + acetonitrile (sample exposed to light) 481/[Ru(bpy) 2 (CH 3 CN)Cl] + 480/Ru−N 4 −CH 3 CN−Cl acetone (sample kept in the dark) 495/[Ru(bpy) 2 (bpe)Cl] + 494/[Ru(bpy) 2 (py)Cl] + acetone (sample exposed to light) 512/[Ru(bpy) 2 (Acetone)Cl] + water/1 M HClO 4 (sample exposed to light) 468/[Ru(bpy) 2 (bpe)H 2 O] 2+ 470/[Ru(bpy) 2 (py)H 2 O] 2+ a Values for the model complexes are taken from ref ; py is pyridine. …”

Analysis of the Photodecomposition Products of Ru(bpy)32+ in Various Buffers and upon Zeolite Encapsulation

“…24 Cation-exchange HPLC has also been used for the synthesis and photochemical studies of bis-(2,2′-bipyridyl) ruthenium(II) complexes. 25 Despite the above-mentioned applications of HPLC for the separation and identification of Ru(II) polypyridyl complexes, there has been no systematic study of the fate of Ru(bpy) 3 2+ upon photolysis in different environments. We report here a reversephase ion-pair HPLC method to estimate the extent of photodecomposition and to separate and identify the different decomposition products of Ru(bpy) 3 2+ .…”

“…Other relevant applications of reverse-phase HPLC include the separation of (1) hydrolysis products of tris(2,2‘-bipyridyl)ruthenium(II) derivatives, (2) water reduction products of Ru(bpy) 3 3+ , and (3) spontaneous reduction products of unstable Ru(IV) oxo complexes . Cation-exchange HPLC has also been used for the synthesis and photochemical studies of bis(2,2‘-bipyridyl) ruthenium(II) complexes …”

Rhodium Mediated N−O Bond Formation

“…This is in contrast with the behaviour of most common triazole complexes. [16,17] 2-D COSY spectroscopic techniques were used to assign the 1 H resonances where possible. The doublets observed at δ ϭ 9.75 and 9.42 can be attributed to the protons at positions a and c of the phenanthroline ring A respectively.…”