Abstract

A pulsed tunable dye laser has been used to obtain excitation spectra and fluorescence decay curves of solid Eu(III)-<i>Datura innoxia</i> and from a series of Eu(III)-containing complexes. Carboxyl and sulfate groups have been demonstrated to be the dominant functional groups for forming binding sites on the cell wall of <i>Datura innoxia</i> at high (≥4) and low (≤3) pH conditions, respectively. The excitation spectra associated with the ⁷<i>F</i>₀ → ⁵<i>D</i>₀ electronic transition of Eu(III) luminescence have been used to provide a measure of the electronic structure factors contributing to the interaction between Eu(III) ions and the binding sites on the cell wall of <i>D. innoxia.</i> The noticeably broadened and asymmetric excitation spectra obtained at high pH conditions are ascribed to multiple binding sites. The corresponding lifetime decay curves exhibited a bi-exponential decay. A pK of 4.5 was determined for the binding of Eu(III) to the cell wall at pH ≥4. Kinetic and thermodynamic studies were also undertaken.

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