The
ability to detect and selectively identify trace amounts of
metal ions is of major importance for drinking water identification
and biological studies. Herein, we report a series of water-soluble
Schiff-base ligands capable of being fluorescent and colorimetric
sensors for metal ions. Upon coordination of the metal ion to the
ligand, quenching of fluorescence is observed, typically in a 1:1
ratio. The selectivity of metal ions Cu
2+
, Ni
2+
, Cr
3+
, and Co
2+
is exhibited via fluorescence
quenching accompanied by colorimetric changes, whereas that of Ag
+
and Co
2+
is observed through colorimetric changes
alone. Additionally, pH sensing studies were performed for the potential
use of these ligands in biological applications.
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