A COLORIMETRIC CHEMOSENSOR BASED ON FLUORESCEIN FOR THE DETECTION OF Zn2+ IN AQUEOUS SOLUTION

A novel quinoline-functionalized fluorescein derivative HL was designed and used as a colorimetric chemosensor for the detection of Zn2+ over other commonly coexistent metal ions in aqueous solution at pH 7.2. Studies on its binding with different metal ions revealed a noticeable naked eye color change in the presence of Zn2+. The mechanism has been supported by Job's plot evaluation, MS and H-1 NMR spectroscopic studies. The association constant and the detection limits of sensor HL to Zn2+ were determined as 1.17x10(5) M-1 and 5.7 nM. This excellent selectivity and sensitive of HL to Zn2+ exhibited its potential application value in the biological monitoring and tracking of Zn2+.