Electron transfer reactions of tris(polypyridine)ruthenium(III) complexes with organic sulfides: importance of hydrophobic interaction

Electron Transfer Reactions of Photochemically Generated Ruthenium(III)–Polypyridyl Complexes with Methionines

“…). The mechanism proposed here is similar to the one postulated for the [Ru(NN) 3 ] 3+ oxidation of organic sulfoxides and sulfides .…”

“…The results of the spectral and kinetic studies on the reaction of six [Ru(NN) 3 ] 3+ complexes with four Mets are presented in this article. Although different methods are available for the generation of Ru(III) from Ru(II) complexes, in the present study Ru(III) complexes have been generated by the visible light oxidation of [Ru(NN) 3 ] 2+ in the presence of molecular oxygen , a green process for the generation of an active oxidant.…”

Phenol oxidation through its adduct formation with chromium complex of 1,4,8,11-tetrakis(2-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane: A theoretical study

“…Similarly, for the oxidation of thioanisole by ruthenium complex ([Ru(bpy) 3 ] 3þ (bpy ¼ 2,2-bipyridine) show a greater rate for 4-methylthioanisole (k ¼ 9.38 Â 10 2 M À1 s À1 ) than for thioanisole (k ¼ 6.55 Â 10 2 M À1 s À1 ) was observed, and a lowest reaction rate for 4-nitrothioanisole (k ¼ 1.16 Â 10 2 M À1 s À1 ) was reported [78]. It establishes that a greater rate constant for the electron-donating CH 3 -or methoxy group at para-position is being expected because of the increasing electron density in the ring, facilitating the radical attack for the oxidation.…”

Effect of Added Pyridine Bases on the Electron Transfer Reaction of Chromium(VI) with Organic Sulfides. Spectral Evidence for the Formation of a Chromium(V) Intermediate

“…Thioethers, simple models of methionines, are excellent electron donors and undergo interesting redox reactions with biologically important metal ions [14][15][16][17][18]. In recent years we have established that organic sulfides react with Fe(III) and Ru(III) via an outer sphere electron transfer mechanism [19][20][21][22]. In the past decades we have postulated an electron transfer mechanism for the reaction of organic sulfides with Cr(VI) [23] and [Cr V (ehba) 2 ] ) [24] (ehba -2-ethyl,2-hydroxybutryic acid).…”

“…This reagent proved useful for the general oxidation of primary and secondary alcohols, even in the presence of double bonds and thioethers. After the introduction of Sarett reagent several new reagents of Cr(VI), pyridinium chlorochromate (PCC), pyridinium dichromate (PDC), pyridinium fluorochromate, 2,2¢-bipyridinium chlorochromate and others have been synthesized and used for the oxidation of organic compounds particularly for sulfides [33][34][35][36][37] Polypyridyl ligands, 2,2¢-bipyridine (Bpy) and 1,10-phenanthroline (Phen), serve as excellent ligands for a variety of metal ions and they play pivotal role in coordination chemistry [19][20][21][22]38]. In recent years comparatively stable oxochromium(V) complexes have been generated using different ligands and these complexes have been used to test the toxicity of chromium [2][3][4][5][38][39][40].…”