Synthesis, Characterization, and Antimicrobial Evaluation of Schiff Base-mixed Ligand Complexes with Divalent Metal Ions Derived from Amoxicillin and Vanillin/Nicotinamide

Title:Synthesis, Characterization, and Antimicrobial Evaluation of Schiff Base-mixed Ligand Complexes with Divalent Metal Ions Derived from Amoxicillin and Vanillin/Nicotinamide

Volume: 30 Issue: 23

Author(s): Manhel R. Bahry, Taghreed H. Al-Noor*, Ali M. Fardous, Ahmad R. Heydari, Aly Abdou, Shaimaa Fayez, Mohamed El-Shazly and Na'il Saleh*

Affiliation:

• Department of Chemistry, Education of Pure Science, College Ibn Al-Haitham, University of Baghdad, Baghdad, Iraq

• Department of Chemistry, College of Science, United Arab Emirates University, Al Ain, P.O. Box 15551, United Arab Emirates

Keywords: Amoxicillin, Schiff base, nicotinamide-mixed ligand complexes, antibacterial evaluation, molecular docking, metal ions.

Abstract:

Introduction: This study focuses on the development of novel antimicrobial agents. A Schiff base ligand, 6-(2-(4-hydroxy-3-methoxybenzylideneamino)-2-(4-hydroxyphenyl)acetamido)-3,3-dimethyl-7-oxo- 4-thia-1-azabicyclo [3.2.0] heptane-2-carboxylic acid, synthesized through the condensation of amoxicillin and vanillin in methanol, served as the foundation. Polydentate mixed ligand complexes were then formed by reacting the Schiff base with metal ions (Fe(II), Co(II), Ni(II), Cu(II), and Zn(II)) and nicotinamide in specific ratios.

Methods: Characterization involved various techniques, such as ¹H-NMR, FT-IR, UV-Vis, and elemental analysis for the ligand, and Atomic Absorption, FT-IR, UV-Vis, magnetic susceptibility, and conductance measurements for the Schiff base-metal ion complexes.

Results: Quantum chemical features of both ligands and metal complexes were computed, refining their electronic and molecular structures theoretically. Antimicrobial activity against Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Salmonella typhi, Acinetobacter baumannii, and Pseudomonas aeruginosa was assessed for the starting materials, ligands, and synthesized complexes, revealing significant effects on certain species. In-silico binding modes with Escherichia coli (PDB ID: 5iq9) were determined through molecular docking.

Conclusion: This study underscores the potential applications of the Schiff base ligands and their metal complexes in developing new antimicrobial agents.

Cite this article as:

Bahry R. Manhel, Al-Noor H. Taghreed*, Fardous M. Ali, Heydari R. Ahmad, Abdou Aly, Fayez Shaimaa, El-Shazly Mohamed and Saleh Na'il*, Synthesis, Characterization, and Antimicrobial Evaluation of Schiff Base-mixed Ligand Complexes with Divalent Metal Ions Derived from Amoxicillin and Vanillin/Nicotinamide, Current Pharmaceutical Design 2024; 30 (23) . https://dx.doi.org/10.2174/0113816128298883240509110406