3+, Zn 2+ and Cd 2+ Ions via Turn-On Fluorescence Responses]]>

摘要

Graphical abstractThe hydrazide (LH) acts as a “TURN-ON”fluorescence sensor for Al3+, Zn2+and Cd2+ions by giving different emission maxima.Display OmittedHighlights?The hydrazide (LH) was synthesized, characterized and evaluated as fluorescence probe for metal ions.?TheLHis weakly emissive but becomes strongly emissive only in presence of Al3+, Zn2+and Cd2+ions.?Jobs plot and mass spectra suggested thatLHto Al3+ion binding ratio of 2:1 and to Zn2+and Cd2+ions of 1:1.?DFT calculations indicated involvement of napthyl ring in the emissive process.AbstractThe hydrazide (LH) using 6-(hydroxymethyl)picolinohydrazide and 2-hydroxynapthaldehyde was synthesized and characterized. This acts as a “TURN-ON”fluorescence sensor for Al3+, Zn2+and Cd2+ions by giving different emission maxima. TheLHitself is weakly emissive having the maximum at 495nm. Gradual addition of chloride salts of Al3+, Zn2+and Cd2+ions toLH, gave rise to emission peaks at 485, 570 and 540nm, in MeOH-HEPES buffer solution (5mM, pH=7.3, 7:3,v/v). Addition of Al3+, Zn2+and Cd2+ions to a solution ofLHgenerate new absorbance and fluorescence peaks due to binding ofL?with Al3+ion in 2:1 ratio; Zn2+and Cd2+ions in 1:1 ratios. Fluorescence reversibility was also studied by adding Al3+, Zn2+and Cd2+ions with Na2EDTA. Calculated detection limits ofLHtowards Al3+, Zn2+and Cd2+ions are 5.7×10?9, 1.09×10?6and 1.64×10