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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 31, Number 12
BKCSDE 31(12)
December 20, 2010 

 
Title
A Chromo- and Fluoroionophoric Thiaoxaaza-Macrocycle Functionalized with Nitrobenzofurazan Exhibiting Mercury(II) Selectivity
Author
Ji Eun Lee, Shim Sung Lee*, Kyu Seong Choi*
Keywords
NO2S2-Macrocycle, Dual-signaling probe, Chromoionophore, Fluoroionophore, Hg2+-selectivity
Abstract
A chromo/fluorogenic NO2S2-macrocycle L functionalized with nitrobenzofurazan unit as a dual-signaling probe was synthesized and structurally characterized by single crystal X-ray analysis. In a cation-induced color change experiment, L exhibited excellent Hg2+ ion selectivity by showing the color change from orange-red to yellow. However, this hypochromic shift by Hg2+ was observed for the weaker coordinating anion system such as NO3 and ClO4 ions. The observed anion effect is due to the strong coordination of anions inhibits the bond formation between Hg2+ and the macrocyclic tert-N atom, which is sensitive to induce the color change. In the fluorometric experiment, L showed chelate-enhanced fluorescence change effect only with Hg2+ ion, together with a change from yellow to green emission. The sensing ability for Hg2+ with the proposed chemosensor L is due to the stable complexation with 1:1 stoichiometry (metal-toligand).
Page
3707 - 3710
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