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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 1
BKCSDE 32(1)
January 20, 2011 

Phosphorescent Azacrown Ether-appended Iridium (III) Complex for the Selective Detection of Hg2+ in Aqueous Acetonitrile
Yinan Li, Ung Chan Yoon, Myung Ho Hyun*
Iridium (III) complex, Azacrown ether, Phosphorescence quenching, Hg2+ detection, Phosphorescent chemosensor
A new phosphorescent cyclometalated heteroleptic iridium (III) complex with an ancillary ligand of 4-azacrownpicolinate was prepared and its metal ion selective phosphorescent chemosensing behavior was investigated. The new iridium (III) complex exhibits notable phosphorescence quenching for Hg2+ in aqueous 50% acetonitrile solution with respect to the selective phosphorescent detection of various metal ions including Li+, Na+, K+, Cs+, Mg2+, Ca2+, Ba2+, Fe2+, Ni2+, Cu2+, Zn2+, Ag+, Pb2+, Cd2+, Cr2+, Cr3+ and Hg2+. The phosphorescence quenching for Hg2+ increased linearly with increasing concentration of Hg2+ in the range of 10 μM - 700 μM even in the presence of other metal ions, except for Cu2+. Consequently, the new iridium (III) complex has the potential to be utilized for the determination of parts per million levels of Hg2+ in aqueous acetonitrile media.
122 - 126
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