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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editor: Gregory W. Faris
  • Vol. 5, Iss. 12 — Sep. 30, 2010

Complexation of Europium(III) with the Zwitterionic Form of Amino Acids Studied with Ultraviolet–Visible and Time-Resolved Laser-Induced Fluorescence Spectroscopy

Anne Heller, Olivia Rönitz, Astrid Barkleit, Gert Bernhard, and Jörg-Uwe Ackermann

Applied Spectroscopy, Vol. 64, Issue 8, pp. 930-935 (2010)


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Abstract

The complex formation of europium(III) with the zwitterionic form of amino acids (alanine, phenylalanine, and threonine) has been studied in aqueous solution. Measurements were performed at I = 0.1 M (NaCl/NaClO4), room temperature, and trace metal concentrations in the range of pH 2 to 8 using ultraviolet–visible (UV-Vis) and time-resolved laser-induced fluorescence spectroscopy (TRLFS). While complexation leads to a significant luminescence enhancement in the emission spectrum of the metal ion, absorption in the UV-Vis spectrum of the amino acid (AA) decreases. As zwitterionic species (AAH), all three ligands form weak complexes with 1:1 stoichiometry and a general formula of EuAAH3+ with the metal. The complex stability constants were determined to be log K ∼ 1 for all complexes, indicating the negligible contribution of the amino acid side chain to the complex formation reaction.

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Vol. 5, Iss. 12 Virtual Journal for Biomedical Optics

Citation
Anne Heller, Olivia Rönitz, Astrid Barkleit, Gert Bernhard, and Jörg-Uwe Ackermann, "Complexation of Europium(III) with the Zwitterionic Form of Amino Acids Studied with Ultraviolet–Visible and Time-Resolved Laser-Induced Fluorescence Spectroscopy," Appl. Spectrosc. 64, 930-935 (2010)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=as-64-8-930

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