首页|Triazole-tethered naphthalimide-ferrocenyl-chalcone based voltammetric and potentiometric sensors for selective electrochemical quantification of Copper(II) ions
Triazole-tethered naphthalimide-ferrocenyl-chalcone based voltammetric and potentiometric sensors for selective electrochemical quantification of Copper(II) ions
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NSTL
Elsevier
A triazole-tethered naphthalimide-ferrocenyl-chalcone (TNFC) derivative was synthesized and investigated for its electrochemical behavior with subsequent successful application as a receptor for the development of differential pulse voltammetric (DPV) and potentiometric sensors for quantification of Cu2+ after receiving confirmatory evidences from UV-Vis, Fluorescence and DFT studies. Cyclic voltammogram of TNFC exhibited two redox peaks at +0.51 V and +0.59 V corresponding to ferrocene/ferrocenium ion redox couple in the potential range of 0 -1.0 V vs Ag/Ag+. On addition of Cu2+, Cyclic voltammogram of TNFC shifted toward more positive potential (anodic shift), indicating the formation of TNFC-Cu2+ complex. DPV sensor demonstrated a selective response towards Cu2+ in the concentration range of 0-26 mu M with detection limit of 0.09 mu M. The TNFC modified carbon paste electrode (CPE) exhibited a selective response for Cu2+ with Nernstian slope of 30.0 mV/decade in the concentration range of 1.0 x 10(-6)-1.0 x 10(-1) M and detection limit 0.79 mu M. High binding constant (3.2 x 10(4) M-1) and negative value of Gibbs free energy (-25.69 kJmol(-1)) calculated using Benesi-Hildebrand (BH) equation confirmed the favorable complexation between TNFC and Cu2+ which was also validated using H-1 NMR and mass spectrometry. The proposed TNFC-CPE was successfully utilized for quantification of Cu2+ content in real samples of water and milk products.
NSTL
Elsevier
