Journal
ANALYST
Volume 136, Issue 11, Pages 2277-2282Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1an15030h
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Funding
- NSFC [20821061, 20931006, U0934003]
- MSTC [2007CB815304]
- NSF of Fujian Province [2008I0027]
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The designed synthesis of a sensitive phosphorescent chemosensor [Ir(ppy)(2)(L1)](PF(6)) ( 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=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)](PF(6)) (2) exhibits bright orange-yellow luminescence originating from [5d(Ir) -> pi*(bpy)] (3)MLCT and [pi(ppy) -> pi*(bpy)] (3)LLCT 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.
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