A Water Soluble Fluorescent Chemosensor Based on Asp Functionalized Naphthalimide for Successive Detection Fe3+ and H2PO4-

The selective recognition of target ions in water is very important and the development of novel water soluble chemosensor is still an intriguing challenge. Herein, a novel water soluble fluorescent sensor based on aspartic acid (Asp) functionalized 1,8-naphthalimide derivative (Asp-NI) has been designed and synthesized. The sensor Asp-NI could dissolve in water and successively detect Fe3+ and H2PO4- in water solution with high selectivity and sensitivity. The detection limits are 4.97 × 10-7 M for Fe3+ and 5.27 × 10-6 M for H2PO4-. Other coexistent competitive metal ions (Hg2+, Ag+, Ca2+, Cu2+, Co2+, Ni2+, Cd2+, Pb2+, Zn2+, Cr3+ and Mg2+) showed no interference in the Fe3+ detection process. The sensor Asp-NI could act as a Fe3+ and H2PO4- controlled “On-Off-On” fluorescent switch. More interestingly, the Fe3+ induced fluorescence quenching process could be totally reversed by the addition of H2PO4-, this “On-Off-On” switching process could be repeated several times with little fluorescence loss. Notably, the actual usage of sensor Asp-NI was further demonstrated by test kits.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author