Highly selective colorimetric fluorescence sensor for Cu 2+: cation-induced 'switching on'of fluorescence due to excited state internal charge transfer in the red/near- …
A 1, 8-naphthalimide-based colorimetric fluorescence perinone dye, receptor 1 is reported herein for the selective detection of Cu2+ over the other heavy and transition metal ions. Receptor 1 shows a strong colorimetric change from orange to purple and a dramatic enhancement of fluorescence intensity due to cation-induced excited state internal charge transfer during the sensing event, that is, a dual optical response that would facilitate ...
