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Keywords:

  • amino acids;
  • europium;
  • luminescence;
  • reaction mechanisms;
  • polyoxometalates

Abstract

A europium-substituted polyoxometalate (K13[Eu(SiW10MoO39)2]28 H2O, EuSiWMo) can selectively bind to basic amino acids, namely, lysine, arginine, and histidine, and induce the emission enhancement of Eu3+ significantly. The mechanism is attributed to electrostatic interactions and hydrogen bonds between basic residues of the amino acids and negative charges of EuSiWMo based on the 1H NMR titration spectra of amino acids and time-resolved fluorescence decay curves of EuSiWMo.