Synthesis of Novel Fluorescent Sensors Based on Naphthalimide Fluorophores for the Highly Selective Hg²⁺-Sensing

Figure 9

Fluorescence intensity before and after adding alternately Hg²⁺/Et₃N into the solution of 1 (4.5 μM), with the different concentrations: 0/0, 0.7/0, 0.7/1.4, 1.4/1.4, and 1.4/4.4.