A Coumarin-Based Fluorescence Probe for Selective Recognition of Cu²⁺ Ions and Live Cell Imaging

Figure 3

Fluorescence intensity changes () of L upon the addition of various metal ions in CH₃CN/HEPES (3 : 2, ) solutions. Cyan bars represented the fluorescence response of L to various metal ions. Red bars represented the subsequent addition of Cu²⁺ to the above solutions. Excitation and emission were recorded at 438 nm and 487 nm, respectively.