Phenothiazine attached Ru(bpy)32+ derivative as highly selective "turn-on" luminescence chemodosimeter for Cu2+

Ajayakumar, Gopalakrishnan ; Sreenath, Kesavapillai ; Gopidas, Karical R. (2009) Phenothiazine attached Ru(bpy)32+ derivative as highly selective "turn-on" luminescence chemodosimeter for Cu2+ Dalton Transactions (7). pp. 1180-1186. ISSN 1477-9226

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2009...

Related URL: http://dx.doi.org/10.1039/B813765J

Abstract

The design of a highly selective "turn-on" luminescence chemodosimeter for Cu2+ is reported. The design strategy made use of the ability of Cu2+ 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)32+. Excitation of the Ru(bpy)32+ leads to electron transfer from the phenothiazine moiety to the MLCT excited state of Ru(bpy)32+ which resulted in efficient quenching of the luminescence. In the presence of excess Cu2+, phenothiazine moiety is oxidized to a stable entity which is incapable of electron donation to the MLCT excited state of Ru(bpy)32+. The emission of the Ru(bpy)32+ moiety is thus restored and we show that this strategy can be used as the basis for sensing micromolar amounts of Cu2+. Only Cu2+ is capable of this reaction, making this an interesting, hitherto unexplored strategy for the selective detection of micromolar amounts of Cu2+.

Item Type:Article
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ID Code:62101
Deposited On:16 Sep 2011 04:37
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