Simultaneous Hydrolysis and Detection of Organophosphate by Benzimidazole Containing Ligand-Based Zinc(II) Complexes

The agricultural use of organophosphorus pesticides is a widespread practice with significant advantages in crop health and product yield. An undesirable consequence the contamination soil groundwater by these neurotoxins resulting from over application run-off. Here, we design synthesize mononuclear zinc(II) complexes, namely, [Zn(AMB)2Cl](ClO4) 1 [Zn(AMB)2(OH)](ClO4) 2 (AMB = 2-aminomethylbenzimidazole), as artificial catalysts inspired phosphotriesterase (PTE) for hydrolysis compounds (OPs) simultaneously detect organophosphate such fenitrothion parathion. Spectral DFT (B3LYP/Lanl2DZ) calculations revealed that complexes have square-pyramidal environment around centers coordination chromophores ZnN4Cl ZnN4O, respectively. Both were used modifier construction biomimetic sensor determination toxic OPs, parathion, phosphate buffer square wave voltammetry. OPs using or generates p-nitrophenol, which subsequently oxidized at surface modified carbon past electrode. catalytic activity was higher than 1, attributed to electronegativity former. oxidation peak potentials p-nitrophenol obtained +0.97 V (vs. Ag/AgCl) cyclic voltammetry (CV) +0.88 Several parameters investigated evaluate performance after incorporation complex on paste electrode (CPE). calibration curve showed linear response ranging between 1.0 μM (0.29 ppm) 5.5 (1.6 (0.28 0.1 (0.028 parathion limit detection (LOD) 0.08 (0.022 0.51 (0.149 results clearly demonstrated CPE has remarkable electrocatalytic towards under optimal conditions.