Abstract
A new ratiometric and exclusively selective fluorescent probe N-butyl-4,5-di[ N-(phenyl)-2-(amino)-acetamino]-1,8-naphthalimide ( 1) was designed and synthesized on the basis of the mechanism of internal charge transfer (ICT). The probe 1 showed exclusively selectivity for Cu II in the presence of a variety of other metal ions in aqueous ethanol solutions and the binding mode of probe 1 with Cu II was 1:1 metal–ligand complex. Fluorescent emission spectra of probe 1 in the presence of Cu II showed a 50 nm blue shift, which is from 521 nm to 471 nm. Furthermore, probe 1 shows the same fluorescent change with the Cu II in living cells.
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