title: Phenothiazine attached Ru(bpy)(3)2+ derivative as highly selective "turn-ON" luminescence chemodosimeter for Cu2+.
abstract: The design of a highly selective "turn-ON" luminescence chemodosimeter for Cu(2+) is reported. The design strategy made use of the ability of Cu(2+) ions to oxidize aromatic amines in acetonitrile solution. The aromatic amine employed here is a phenothiazine moiety which is covalently linked to one of the bipyridine units of Ru(bpy)(3)(2+). Excitation of the Ru(bpy)(3)(2+) leads to electron transfer from the phenothiazine moiety to the MLCT excited state of Ru(bpy)(3)(2+) which resulted in efficient quenching of the luminescence. In the presence of excess Cu(2+), phenothiazine moiety is oxidized to a stable entity which is incapable of electron donation to the MLCT excited state of Ru(bpy)(3)(2+). The emission of the Ru(bpy)(3)(2+) moiety is thus restored and we show that this strategy can be used as the basis for sensing micromolar amounts of Cu(2+). Only Cu(2+) is capable of this reaction, making this an interesting, hitherto unexplored strategy for the selective detection of micromolar amounts of Cu(2+).
authors.affiliation: Photosciences and Photonics, Chemical Sciences and Technology Division, National Institute for Interdisciplinary Science and Technology, Council of Scientific and Industrial Research (CSIR), Trivandrum 695 019, India. gopidaskr@rediffmail.com
authors.forename: Gopalakrishnan
authors.initials: G
authors.lastname: Ajayakumar
authors.forename: Kesavapillai
authors.initials: K
authors.lastname: Sreenath
authors.forename: Karical R
authors.initials: KR
authors.lastname: Gopidas