Nano-sized cadmium-benzothiazole Schiff base complexes: Synthesis, characterization, and the impact of surfactants for cadmium determination

In this paper, three benzothiazole-Schiff bases, 2-([benzothiazol-2-ylimino]methyl)phenol (L1), 2-([benzothiazol-2-ylimino]methyl)-4-chlorophenol (L2), and 2-([benzothiazol-2-ylimino]methyl)-4-bromophenol (L3), were environmentally friendly prepared using a microwave assisted synthesis. These synthesized ligands were used to chelate Cd (II) to produce three nano-sized solid complexes, which were characterized using TEM, FT-IR, and XRD. Then three developed spectrophotometric approaches for ultra-trace quantification of divalent cadmium have been investigated and the sensitivity of these developed methods was enhanced using micellar medium. The influence of the type and amount of buffer, pH, type of surfactant, and amount of ligand during quantification of cadmium ion were monitored and determined. The calibration curve was valid over the concentration ranges of 1.0-9.0, 1.1-12.0, and 1.5-14.9 mu g mL(-1) of Cd (II) with detection limits of 0.407, 0.313, and 0.453 mu g mL(-1) using L1, L2, and L3, respectively. The described approaches had been effectively applied for Cd (II) ion quantification in some water samples.

Automated summary

In this study, three benzothiazole-Schiff bases were synthesized and used to chelate Cd (II) to form nano-sized solid complexes. These complexes were characterized using TEM, FT-IR, and XRD. Three spectrophotometric approaches for ultra-trace quantification of divalent cadmium were developed and their sensitivity was enhanced using micellar medium. The influence of various factors on the quantification of cadmium ion was investigated and determined. The developed methods showed good calibration curve validity and low detection limits, and were successfully applied to quantify Cd (II) ion in water samples.