A Thallium Ion Sensor Development Based on the Synthesized (E)‐N′‐(Methoxybenzylidene)‐4‐ Methylbenzenesulfonohydrazide Derivatives: Environmental Sample Analysis

Abstract In this research work, three new derivatives of ( E )‐ N ʹ‐(methoxybenzylidene)‐4‐methylbenzenesulfonohydrazide (MBMBSH) were prepared by means of a condensation technique from the methoxybenzaldehyde and 4‐methyl‐benzenesulphonylhydrazine in good yields, which were crystallized in EtOH and MeOH. MBMBSH ligands were examined through spectroscopic progression ( 1 H‐NMR, 13 C‐NMR, FTIR, and UV‐Visible). Structures of the MBMBSH lignads confirmed with a single crystal X‐ray diffraction scheme (SCXRDS). MBMBSH derivatives used for the imminent recognition of heavy metal ion (thallium) based on a reliable current‐voltage (I−V) procedure. Smooth GCE was covered with a light layer of MBMBSH molecules and consequently modified toward a sensitive and selective thallium ion sensor using conducting polymer matrix, Nafion (NF). Analytical parameters such as sensitivity, LOQ, and LOD of GCE/4‐MBMBSH/NF as a sensor were calculated from the calibration plot and found as 622.9 pAμM −1 cm −2 , 250.0 mM, and 75.0 pM respectively. This prospective sensor (GCE/4‐MBMBSH/NF) applied to the careful determination of thallium ion in spiked environmental samples and found satisfactory result.