An iridium(III) complex of oximated 2,2'-bipyridine as a sensitive phosphorescent sensor for hypochlorite.
Analyst
; 136(11): 2277-82, 2011 Jun 07.
Article
em En
| MEDLINE
| ID: mdl-21509376
ABSTRACT
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) â π*(bpy)] (3)MLCT and [π(ppy) â π*(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.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Compostos Organometálicos
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Ácido Hipocloroso
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Complexos de Coordenação
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Ano de publicação:
2011
Tipo de documento:
Article