A new “turn-on” fluorescent sensor for highly selective sensing of H 2 PO 4 −

Abstract H2PO4− plays an indispensable role in chemical, biological and environment aspects. It is essential to detect H2PO4− sensitively. In this article, we designed and synthesized a novel sensor P-Fe based on naphthalimide. Hence, P-Fe can selectively and sensitively detect H2PO4− ion by means of “turn-on” detection. After adding H2PO4−, the P-Fe solution gives a strong bright yellow fluorescence. In addition, the corresponding detection limit of P-Fe to H2PO4− is estimated to be 1.897 × 10− 7 mol/L.