Fluorescent chemosensors for metal ions based on 3-(2-benzoxazol-5-yl)alanine skeleton

Magda Milewska 1 , Katarzyna Guzow 1 , and Wiesław Wiczk 1
  • 1 Faculty of Chemistry, University of Gdańsk, 80-952, Gdańsk, Poland

Abstract

The ability of new chelate ligands, benzoxazol-5-yl-alanine derivatives substituted in position 2 by heteroaromatic substituent, to form complexes with selected metal ions in acetonitrile are studied by means of absorption and steady-state and time-resolved fluorescence spectroscopy. Among the ligands studied, only azaaromatic derivatives form stable complexes with transition metal ions in the ground state. Their absorption bands are bathochromically shifted enabling to use those ligands as ratiometric sensors. The fluorescence of each ligand is quenched by metal ions, however, in the presence of Cd(II) and Zn(II) ions a new red shifted emission band is observed.

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