A tripodal ligand incorporating the dansyl group

摘要

A new tripodal ligand containing the dansyl chromophore (1) has been synthesied and characterized. This ligand forms complexes in acetonitrile/water solutions only with Cu~(2+), Co~(2+), Zn~(2+), and Cd~(2+) ions. This complexation causes pronounced changes in the fluorescence spectra. The equilibrium is controlled by pH conditions: at neutral pH the ligand shows a remarkable selectivity towards Cu~(2+) ions, suggesting a possible use for 1 as a luminescent chemosensor for this ion.