title: Photoinduced electron transfer reactions of ruthenium(II) phenanthroline complexes with dimethylaniline in aqueous and micellar media.
abstract: Four [Ru(NN)(3)](2+) complexes (NN = polypyridine) with ligands of varying hydrophobicity with different charges +2, 0 and -4 were synthesized. The photophysics and photoinduced electron transfer reactions of these Ru(II)-complexes with dimethylaniline (DMA) as the quencher have been studied in aqueous medium and ionic and non-ionic micellar medium. The extent of binding of the complexes with the surfactant interface is evident from the calculated binding constant values (K). Dimethylaniline (DMA) being a neutral quencher, the hydrophobic and electrostatic interactions competing with one another and their combined effect with the surfactants were reported by observing the quenching rate constant (k(q)) values. The formation of anilinium cation radical in transient absorption spectrum confirms the excited state electron transfer reactions of ruthenium(II) complexes with dimethylaniline. The calculated rate constant values (k(q)) are in good agreement with the experimental k(q) values giving quantitative evidence for the bimolecular reductive quenching rate constant for the complexes with DMA. Pseudophase ion exchange model is successfully applied to analyse the quenching data.
authors.affiliation: Hajee Karutha Rowther Howdia College, Uthamapalayam, Tamilnadu, India.
authors.forename: Ramanathan
authors.initials: R
authors.lastname: Sangiliapillai
authors.forename: Ramdass
authors.initials: R
authors.lastname: Arumugam
authors.forename: Rajkumar
authors.initials: R
authors.lastname: Eswaran
authors.forename: Rajagopal
authors.initials: R
authors.lastname: Seenivasan
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry; D004579:Electron Transport; D007474:Ion Exchange; D008823:Micelles; D017830:Octoxynol / Q000737:chemistry; D009942:Organometallic Compounds / Q000737:chemistry*; D010618:Phenanthrolines / Q000737:chemistry*; D055668:Photochemical Processes; D012428:Ruthenium / Q000737:chemistry*; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D014867:Water / Q000737:chemistry*
chemical_list: D000814:Aniline Compounds; D002593:Cetrimonium Compounds; D008823:Micelles; D009942:Organometallic Compounds; D010618:Phenanthrolines; D014867:Water; D012967:Sodium Dodecyl Sulfate; D012428:Ruthenium; D017830:Octoxynol; D000077286:Cetrimonium