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Type: Journal article
Title: Complexation of Zn²⁺ by the Fluorophore 2-((E)-2-Phenyl)ethenyl-8-(N-4-methylbenzenesulfonyl)aminoquinol-6-yloxyacetic Acid: A Preparative, Potentiometric, UV-visible, and Fluorescence Study
Other Titles: Complexation of Zn2+ by the fluorophore 2-((E)-2-phenyl)ethenyl-8-(N-4-methylbenzenesulfonyl)aminoquinol-6-yloxyacetic acid: A preparative, potentiometric, UV- visible, and fluorescence study
Author: Coleman, H.
May, B.
Lincoln, S.
Citation: Australian Journal of Chemistry, 2010; 63(10):1448-1452
Publisher: C S I R O Publishing
Issue Date: 2010
ISSN: 0004-9425
Statement of
Hilary C. Coleman, Bruce L. May, Stephen F. Lincoln
Abstract: The preparation of the Zn²⁺ specific fluorophore 2-((E)-2-phenyl)ethenyl-8-(N-4-methylbenzene-sulfonyl)aminoquinol-6-yloxyacetic acid, H₂3, is described. The protonated form, H33+, is characterized by pKₐ values of 2.71 ± 0.03, 4.92 ± 0.03, and 10.46 ± 0.03 in 25% (v/v) aqueous ethanol 0.10 mol L⁻¹ in NaClO₄ at 298.2 K determined by potentiometric titration. At pH 6.6, but otherwise under the same conditions, the dianion, 3²⁻, forms the fluorescent complexes [Zn(3)] and [Zn(3)₂]²⁻, characterized by log(K1/L mol⁻¹) = 10.5 ± 0.20 and log(K₂/L mol⁻¹) = 11.1 ± 0.1, respectively, as determined by fluorimetry. These data are compared with analogous data for the structurally similar and widely used fluorophore 2-methyl-8-p-toluenesulfonamido-6-quinolyloxyacetic acid (Zinquin A).
Rights: © CSIRO 2010
RMID: 0020101034
DOI: 10.1071/CH10173
Appears in Collections:Environment Institute publications
Chemistry and Physics publications

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