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|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|
|Citation:||Australian Journal of Chemistry, 2010; 63(10):1448-1452|
|Publisher:||C S I R O Publishing|
|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|
|Appears in Collections:||Environment Institute publications|
Chemistry and Physics publications
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