A novel colorimetric probe derived from isonicotic acid hydrazide for copper (II) determination based on internal charge transfer (ICT)

摘要

A novel isonicotic acid hydrazide Schiff base derivative N'-(3,5-di-tert-butyl-2-hydroxy-benzylidene) isonicotinohydrazide (DHIH) has been synthesized and developed as a high selective and sensitive colorimetric probe for Cu2+ determination. Addition of Cu2+ to the solution of DHIH resulted in a rapid color change from colorless to yellow together with an obvious new absorption band appeared at the range of 400-440 nm by forming a 1:1 complex. Experimental results indicated that the DHIH could provide absorption response to Cu2+ with a linear dynamic range from 1.0 x 10(-5) to 1.0 x 10(-4) mol/L. The detection limit of Cu2+ was 5.24 x 10(-7) mol/L with good tolerance of other metal ions. (C) 2015 Elsevier B.V. All rights reserved.