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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 34, Number 5
BKCSDE 34(5)
May 20, 2013 

A Carbazole-Attached NO2S2-Macrocycle Exhibiting Hg2+ and Cu2+ Selectivity
Seul-Gi Lee, Eun-Ju Kang, Shim Sung Lee*
Carbazole-attached macrocycle, Fluoroionophore, Mercury(II), Copper(II), X-ray crystal structure
A synthesis and cation-induced fluorescent behavior of the carbazole-attached NO2S2-macrocycle (L) is described and structurally characterized by single crystal X-ray analysis. The photoluminescence spectrum of L in 80% CH3CN/CH2Cl2 displays a peak maximum at 431 nm (blue emission). In the metal-induced fluorometric experiment, L showed a drastic chelation-enhanced fluorescence quenching (CHEQ) effect only with Hg2+ and Cu2+. In ESI-mass study, a 1:1 stoichiometry for complexation of L with Hg2+ was confirmed, suggesting the unique sensing behavior of the proposed ligand L due to the selective complexation affinity for Hg2+. The observed results indicate that L is a promising turn-off type fluoroionophore for Hg2+ and Cu2+ detections. Additionally, the Ag+ complex of the precursor macrocycle was prepared and its solid structure was crystallographically characterized.
1429 - 1434
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