Synthesis of 3-hydroxy-4-{[(2E)-2-(hydroxyimino)ethylidene]amino}-naphthalene-1-sulfonic acid for Complex formation of Cr3+, Co2+, Ni2+ and Cu2+ ions
DOI:
https://doi.org/10.54361/LJMR.19.2.16Keywords:
4-(2-hydroxbenzylideneamino)-3-hydroxnaphtalene-1-sulfonic acid, Pathogenic bacteria, Schiff-base complexes.Abstract
Purpose: This study aimed to synthesize and characterize new Schiff-base complexes derived from 3-hydroxy-4-{[(2E)-2-(hydroxyimino)ethylidene]amino}-naphthalene-1-sulfonic acid and to evaluate their structural properties and antimicrobial activity. Materials and Methods: The complexes of Cr³⁺, Co²⁺, Ni²⁺, and Cu²⁺ were synthesized and characterized using IR spectroscopy, molar conductivity, UV-Vis spectroscopy, magnetic susceptibility measurements, and elemental analysis (C, H, N, and S). The coordination behavior of the ligand was investigated based on spectral and magnetic data. Results: Elemental analysis confirmed a 1:1 metal-to-ligand stoichiometry in all complexes. Molar conductivity values indicated that the complexes are non-electrolytic. Magnetic moment data revealed that the Ni²⁺ complex is diamagnetic, while Co²⁺, Cr³⁺, and Cu²⁺ complexes are paramagnetic. IR spectral data suggested coordination through the hydroxyl and imino groups. Electronic spectra showed n→π* and π→π* transitions, supporting octahedral geometry for all complexes. Conclusion:The structural analysis confirmed the formation of stable, octahedral Schiff-base metal complexes. These compounds, including the free ligand, demonstrated notable antimicrobial activity against pathogenic bacteria such as Proteus, Bacillus subtilis, Staphylococci, and Pseudomonas aeruginosa.
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