A new Schiff base fluorescence probe, 3-Allylsalicylaldehyde salicyl-hydrazone (L), for Mg2+ was designed and synthesized. The fluorescence of the sensor L was enhanced remarkably by Mg2+ with 2: 1 binding ratio, and the binding constant was determined to be 1.02 x 10(7) M-1. Probe L had high sensitivity for Mg2+ in a solution of DMF/water (4: 1, v/v, pH 7.5), and the detection limit was 4.88 x 10(-8) mol/L. Common coexistent metal ions, such as K+, Na+, Ag+, Ca2+, Zn2+, Ba2+, Bi2+, Cu2+, Ni2+, Hg2+, Fe3+, and Al3+, showed little or no interference on the detection of Mg2+ in solution. The flu...
