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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 28, Number 5
BKCSDE 28(5)
May 20, 2007

Title	Tetradiazo(o-carboxy)phenylcalix[4]arene for Determination of Pb²⁺ Ion
Author	Le Van Tan, Duong Tuan Quang, Min Hee Lee, Tae Hyun Kim, Hasuck Kim, Jong Seung Kim*
Keywords	UV-Vis, Chromoionophore, Calixarene, Lead, Spectrophotometry
Abstract	A new azocalix[4]arene, 5,14,17,23-tetra[(2-benzoic acid)(azo)phenyl] calix[4]arene (2), has been prepared by hydrolysis of its ester derivative and characterized by ¹H NMR, IR, UV-Vis spectroscopy and elemental analysis. Based on UV spectral changes, we found that 2 exhibits Pb²⁺ ion selectivity. In basic media, Pb²⁺ forms a 1:1 complex with the ligand. Beer’s law is obeyed in the range of 2.0 × 10^?6 ? 2.4 × 10^?5 mol L^?1 of Pb²⁺. The molar absorptivity (ε ) of 2-Pb²⁺ complex is 1.89 × 10⁴ L mol^?1 cm^?1 at 440 nm, and the detection limit is 1.6 × 10^?6 mol L^?1.
Page	791 - 794
Full Text	PDF

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