A novel histidine functionalized 1,8-naphthalimide-based fluorescent chemosensor for selective and sensitive detection of Hg2+ in water
Hg2+ is one of the the most threatening heavy metal ions. So finding a quick and easy way to detection Hg2+ is very important. In this work, we designed and synthesized a simple Hg2+ chemosensor Z, which bearing on carboxyl and imidazolyl moiety as hydrophilic groups site and Hg2+ binding site, while naphthalimide moiety as signal group. Interestingly, the sensor Z could dissolve in water and shown high selectivity and sensitivity for Hg2+ in water solution. Other coexistent competitive metal ions (Fe3+, Ag+, Ca2+, Cu2+, Co2+, Ni2+, Cd2+, Pb2+, Zn2+, Cr3+ and Mg2+) had no interfered in process of detect Hg2+. The detection limit of the sensor Z toward Hg2+ was 1.785×10-7 M, which indicated its high detection sensitivity. Meanwhile, the immediately response of Z to Hg2+ provide a real-time detection method for Hg2+ in water solution. Moreover, the sensor Z can be cyclic utilization.