N-butyl-4,5-dibutylamine-1,8-naphthylimide with a donor-acceptor structure was successfully synthesized by one-pot method using 4,5-dibromo-1,8-naphthalic anhydride and butylamine as starting materials. The structure was characterized by NMR and elemental analyses, and the optical and electrochemical properties were investigated. The compound can be used to selectively bind Cu2+, along with obvious blueshifts of fluorescence spectrum.