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Enhancing and inhibiting effects of benzenediols on chemiluminescence of a novel cyclometallated iridium(III) complex
Author(s) -
Dong Yong Ping,
Huang Li,
Tong Bi Hai,
Shi Ming Juan,
Zhang Wang Bing,
Zhang Qian Feng
Publication year - 2011
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.1343
Subject(s) - iridium , chemistry , catechol , chemiluminescence , hydroquinone , resorcinol , potassium permanganate , photochemistry , inorganic chemistry , nuclear chemistry , catalysis , organic chemistry
A novel chemiluminescence (CL) system, including the cyclometallated iridium(III) complex {tris[1‐(2,6‐dimethylphenoxy)‐4‐(4‐chlorophenyl)phthalazine]iridium}, potassium permanganate and oxalic acid, is proposed for the determination of benzenediols. This method is based on the fact that hydroquinone and catechol exhibited an inhibiting effect, while resorcinol exhibited an enhancing effect on CL intensity. The optimum conditions for CL emission were investigated. Under optimal conditions, the detection limits of hydroquinone, catechol and resorcinol were 6.4 × 10 −8 , 2.7 × 10 −9 and 8.1 × 10 −7 mol/L, respectively. The method has been successfully applied to the determination of benzenediols in different types of water sample. The luminophors of the CL systems were all identified as the metal–ligand charge‐transfer (MLCT) excited state of the iridium complex. Copyright © 2011 John Wiley & Sons, Ltd.