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Tetradiazo(o-carboxy)phenylcalix[4]arene for determination of Pb2+, ion
- Authors
- Van Tan, L (Van Tan, Le); Quang, DT (Quang, Duong Tuan); Lee, MH (Lee, Min Hee); Kim, TH (Kim, Tae Hyun); Kim, H (Kim, Hasuck); Kim, JS (Kim, Jong Seung)
- Issue Date
- May-2007
- Publisher
- KOREAN CHEMICAL SOC
- Citation
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.28, no.5, pp 791 - 794
- Pages
- 4
- Journal Title
- BULLETIN OF THE KOREAN CHEMICAL SOCIETY
- Volume
- 28
- Number
- 5
- Start Page
- 791
- End Page
- 794
- ISSN
- 0253-2964
1229-5949
- 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 H-1 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 x 10(-6)-2.4 x 10(-5) mol L-1 of Pb2+. The molar absorptivity (epsilon) of 2-Pb2+ Complex is 1.89 x 10(4) L mol(-1) cm(-1) at 440 nm, and the detection limit is 1.6 x 10(-6) mol L-1.
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