4 years ago

A highly selective colorimetric chemosensor for copper(II) based on N-phenyl-N’-(pyridin-2-yl)thiourea(HPyPT)

A highly selective colorimetric chemosensor for copper(II) based on N-phenyl-N’-(pyridin-2-yl)thiourea(HPyPT)
An efficient synthesis and applications of a N-Phenyl-N’-(pyridin-2-yl)thiourea(HPyPT) as a chemosensor for the selective detection of Cu2+ over other common metal ion is described. The HPyPT chemosensor could detect Cu2+ by forming 1:1 complex in acidic media. The complex exhibits maximum absorption at 393nm with molar absorptivity 5.795×103 lmol−1cm−1 and Sandell’s sensitivity was found to be 0.01096μgcm−2 of Cu2+; Beer’s law is obeyed in the range of 1μgcm−3–14μgcm−3. The standard deviation for ten replicate samples at 10μgcm−3 level of Cu2+ is found to be 0.08. The detection limit was found to be 0.065μgcm.−3 The yellowish green coloured complex of Cu2+ with HPyPT is stable up to 12h. Under optimized conditions, the HPyPT shows excellent sensitivity and selectivity for Cu2+ over a series of metal ions such as Fe2+, Fe3+, Al3+, Zn2+, Sn2+, Ni2+, Mn2+ Co2+, Cr+2, Cd+2, Hg2+, Au+3and Mg2+. The present chemosensor shows stable and consistent yellowish green coloration in acetic acid and there is no need to use buffer solutions for complexation. Moreover, the application of the present chemosensor was extended for the detection of Cu2+ from water, copper alloys such as brass and Monel metal.

Publisher URL: www.sciencedirect.com/science

DOI: S0925400517310584

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