Fluorescent chemosensors for metal ions based on 3-(2-benzoxazol-5-yl)alanine skeleton |
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Authors: | Magda Milewska Katarzyna Guzow and Wies?aw Wiczk |
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Institution: | (1) Department of Chemistry, Seoul National University, Seoul, 151-747, Korea; |
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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.
![MediaObjects/11532_2010_36_Fig1_HTML.jpg](/content/Y5U77K15W1R37883/MediaObjects/11532_2010_36_Fig1_HTML.jpg) |
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