Abstract
In a weakly acidic or neutral medium, fluoroquinolones (FLQs) such as pefloxacin (PEF), levofloxacin (LEV), lomefloxacin (LOM) and fleroxacin (FLE), have similar fluorescence spectral characteristics. Their fluorescence intensities could be significantly quenched by palladium. In this work, taking Pd(II)-PEF system as an example, the absorption and fluorescence spectral changes were investigated. In addition, the density functional theory (DFT) methods (B3LYP) was performed to optimize those compounds. A Pd (II) molecule bond two PEF molecules to form a square planar chelate with two six-membered rings, and the quenching effect of Pd(II) on PEF fluorescence is a single static quenching event. The detection limits were in the range of 1.74-3.42 ng/mL using the above four FLQs. Most of metal ions and inorganic anions have no interference. The method was applied to the determination of Pd(II) in environmental water.
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