Abstract

A new pyrazole derived Schiff base (E)-N'-(2,3-dihydroxybenzylidene)-1-phenyl-5-(thiophen-2-yl)-1H-pyrazole-3-carbohydrazide (W) was devised and synthesized, which exerted a splendid sensitivity and selectivity fluorescence “turn-on” for Al3+, accompanied by a solution color changed to bright green. The complex W[Al3+] could be applied as a sequential sensor to Fe3+. The lowest detection limits of W for detecting Al3+ and Fe3+ ions were 9.42 × 10-9 M and 2.1 × 10-8 M singly. The stoichiometric ratio of W to both Al3+ and Fe3+ was determined to be 1:2 by Job’s Plot, 1H NMR and mass spectrometry titration as well as theoretical arithmetic. Additionally, W was triumphantly applied to detecting Al3+ and Fe3+ in running water.

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