Azo-azomethine complex activity and sensor potential toward Ca(II) ion in life samples: The spectroscopic and morphological studies

Abstract

Current coordination chemistry trends are designing and synthesizing new azo-azomethine alkaline earth metal complexes for medicinal, diagnostic, and catalytic uses. Because of their many uses, it has been noted for decades that azo-azomethine metal complex chemistry is receiving particular attention. Therefore the present work involves the synthesis of a new azo-azomethine ligand (L) by condensation of 4-((3-formyl-4-hydroxy-5-methoxyphenyl)diazenyl)benzoic acid and 3-methoxy aniline. From that azo-azomethine ligand, complex Ca(II) has been prepared (L-Ca(II)). EDX, FT-IR, 1H NMR, 13C NMR, UV–vis, thermal analytic techniques, mass spectrometry, FESEM, AFM, and magnetic susceptibility examinations were used to describe the structure. The new complex of azo-azomethine was used to fabricate coated carbon brush electrode as an ionophore of the membrane sensor for the analytical determination of Ca2+. The response of Ca(II) was linear over the concentration ranging from 1.0 × 10−6 –1.0 × 10−1 mol/L, with selectivity coefficients between 0.001455–0.411661, and detection limit for 1.9 × 10−6 mol/L. The membrane responded within 8 s, depending on the concentration of Ca2+. The fabricated CBE demonstrated excellent selectivity, as well as remarkable repeatability and reproducibility, in the determination of Ca2+ ions. The experimental results provided compelling evidence of the sensor's effectiveness in accurately measuring the Ca2+ levels in various real-life samples.