Fe(II)-Based Metallo-Supramolecular Polymer Film as a Sensing Material for the Detection of Nitrite

Abstract

In this work, we report the synthesis of a mono metallic supramolecular polymer for constructing a new nonenzymatic electrochemical nitrite sensor. Metallo supramolecular polymer have been prepared by the complexation reaction of a ligand bearing terpyridine moieties [4′,4′′′′-(1,4 Phenylene) bis (2,2′:6′,2′′-terpyridine] with Fe(II) salts (Fe salt: Ligand-1:1) (polyFe). The polyFe was characterized with the UV/Vis titration and FTIR. The glassy carbon electrode (GCE) was used for fabricating ployFe_GCE via a drop casting method that was used for detecting nitrite through the oxidation process. The kinetics of the irreversible oxidation mechanism was studied using scan rate. Amperometry and CV techniques were used for studying the effectiveness of the polyFe_GCE for detecting nitrite at different concentrations. The polyFe_GCE was also used for interference, reproducibility, and stability study. We utilized the proposed sensor further for analyzing nitrite in tap water. The recovery obtained was satisfactory with relatively low value of standard deviation.

Facile Chemical Synthesis of Co–Ru-Based Heterometallic Supramolecular Polymer for Electrochemical Oxidation of Bisphenol A: Kinetics Study at the Electrode/Electrolyte Interface

“…Formal potentials for both the bare and modified electrodes were set at 0.304 and 0.234 V, respectively. The charge transfer resistance ( R CT ) is represented by the semicircle portion of the Nyquist plot at higher frequencies, and the electron transfer is represented by the linear portion at lower frequencies corresponding to diffusion-controlled phenomena . The small semicircle part of the modified electrode (∼100 Ω) compared to the bare GCE (∼320 Ω) is likely to enhance electron transfer at the interface.…”