A new “turn-on” fluorescent sensor for highly selective sensing of H2PO4−

We designed and synthesized a novel sensor P-Fe based on Schiff base. The P-Fe solution gives a strong bright yellow fluorescence after adding H2PO4−. Hence, P-Fe can selectively and sensitively sense H2PO4− ion by means of “turn-on” detection. The detection limit of P-Fe to H2PO4− is 1.897 × 10− 7 mol/L.86