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Issue 11, 2011
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An iridium(III) complex of oximated 2,2′-bipyridine as a sensitive phosphorescent sensor for hypochlorite

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Abstract

The designed synthesis of a sensitive phosphorescent chemosensor [Ir(ppy)2(L1)](PF6) (1) (Hppy = 2-phenylpyridine, L1 = 4′-methyl-2,2′-bipyridyl-4-carbaldehyde oxime) was carried out for selective detection of hypochlorite (ClO). Complex 1 is weakly emissive in solution at ambient temperature due likely to rapid isomerization of C[double bond, length as m-dash]N–OH as an effective non-radiative decay process. When 1 reacts with ClO, however, the emission is remarkably enhanced, in which the oxime in L1 is converted to a carboxylic acid in L2 (4′-methyl-2,2′-bipyridine-4-carboxylic acid). The produced complex [Ir(ppy)2(L2)](PF6) (2) exhibits bright orange-yellow luminescence originating from [5d(Ir) → π*(bpy)] 3MLCT and [π(ppy) → π*(bpy)] 3LLCT triplet excited states as suggested from the DFT computational studies. The selective and competitive experiments reveal that complex 1 shows high sensing selectivity and sensitivity for ClO over other reactive oxygen species (ROS) and metal ions.

Graphical abstract: An iridium(iii) complex of oximated 2,2′-bipyridine as a sensitive phosphorescent sensor for hypochlorite

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Publication details

The article was received on 11 Jan 2011, accepted on 25 Mar 2011 and first published on 21 Apr 2011


Article type: Paper
DOI: 10.1039/C1AN15030H
Citation: Analyst, 2011,136, 2277-2282
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    An iridium(III) complex of oximated 2,2′-bipyridine as a sensitive phosphorescent sensor for hypochlorite

    N. Zhao, Y. Wu, R. Wang, L. Shi and Z. Chen, Analyst, 2011, 136, 2277
    DOI: 10.1039/C1AN15030H

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