“…Therefore, the naphthalimide compounds have been applied to detect different metal ions such as Cu 2+ , Zn 2+ , Hg 2+ , Ag + , Fe 3+ , Cr 3+ , or fluoride ion [ 13 , 22 , 23 , 24 , 25 ]. Also, naphthalimide derivatives were explored successfully for monitoring hypochlorous acid and hypochlorite [ 26 , 27 , 28 ]. Some naphthalimide-based fluorescent compounds were developed for detecting hydrogen sulfide, formaldehyde, or phosgene [ 29 , 30 , 31 , 32 ].…”