Synthesis, characterization, and antimicrobial activity of Cu(II) and Zn(II) complexes with N,N-bis(4-methoxybenzylidene)ethylenediamine or  N-(4-methoxybenzylidene)ethylenediamine Schiff base

Adrienne Ndiolene; Tidiane Diop; Mouhamadou Sembene Boye; Bruno Faure; Aminata Diasse-Sarr; Michel Giorgi

doi:10.5155/eurjchem.16.2.169-177.2651

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Published: Jun 30, 2025

DOI: https://doi.org/10.5155/eurjchem.16.2.169-177.2651

Keywords:

Synthesis, Schiff base, Characterization, Crystal structure, Antimicrobial activity, Cu(II) and Zn(II) complexes

Section

Research Article

Issue

Vol. 16 No. 2 (2025): June 2025

Dates

Received 2025-01-22
Accepted 2025-05-02
Published 2025-06-30

Adrienne Ndiolene

Département de Chimie, Université Cheikh Anta Diop de Dakar, BP 5005 Fan-Dakar, Sénégal

https://orcid.org/0009-0004-2411-8836

Tidiane Diop

Département de Chimie, Université Cheikh Anta Diop de Dakar, BP 5005 Fan-Dakar, Sénégal

https://orcid.org/0000-0003-1098-451X

Mouhamadou Sembene Boye

Département de Physique Chimie, Faculté des Sciences et Technologies de l’Education et de la Formation, Université Cheikh Anta Diop, Boulevard Habib, Bourguiba, BP 5036 Fann-Dakar, Sénégal

https://orcid.org/0009-0000-8447-6409

Bruno Faure

ISM2 - Institut des Sciences Moléculaires de Marseille, Campus Saint Jérôme Av. escadrille Normandie Niemen BP 531 13397 Marseille Cedex 20, France

https://orcid.org/0000-0003-2117-8310

Aminata Diasse-Sarr

Département de Chimie, Université Cheikh Anta Diop de Dakar, BP 5005 Fan-Dakar, Sénégal

https://orcid.org/0000-0002-4143-4281

Michel Giorgi

AMU SPEC - Spectropôle - Aix Marseille Université, Campus Scientifique de Saint Jérôme Service 511 13397 Marseille Cedex 20, France

https://orcid.org/0000-0002-4367-1985

Abstract

Seven mononuclear complexes were synthesized by mixing N,N'-bis(4-methoxy benzaldehyde)ethylenediamine (L) or N-(4-methoxybenzylidene)ethylenediamine (L₁) and copper or zinc salts. These compounds were characterized by IR, ¹H NMR, UV-vis, fluorescence spectroscopy, molar conductimetric, and elemental (CHN) analysis techniques. The crystal structures of the zinc complexes were determined by single crystal X-ray diffraction studies. Crystal data for C₁₈H₂₀I₂N₂O₂Zn: Monoclinic, space group P2₁/c (no. 14), a = 10.45670(10) Å, b = 13.28610(10) Å, c = 15.43490(10) Å, β = 96.4300(10)°, V = 2130.86(3) Å³, Z = 4, Dcalc = 1.919 g/cm³, 46801 reflections measured (8.51° ≤ 2Θ ≤ 145.92°), 4231 unique (R_int = 0.0565, R_sigma = 0.0185) which were used in all calculations. Crystal data for C₁₈H₂₀Br₂N₂O₂Zn: Monoclinic, space group P2₁/c (no. 14), a = 10.30071(17) Å, b = 13.00839(18) Å, c = 15.0084(2) Å, β = 97.3057(14) °, V = 1994.74(5) Å³, Z = 4, Dcalc = 1.737 g/cm³, 103282 reflections measured (4.158° ≤ 2Θ ≤ 59.492°), 5360 unique (R_int = 0.0394, R_sigma = 0.0161) which were used in all calculations. Crystal structures show a distorted tetrahedral geometry around the zinc metal. The ligand is bidentate chelating with imine nitrogen atoms. Fluorescence spectroscopy shows a reduction in the fluorescence intensity of the complexes relative to the ligand. This reduction is due to the presence of metal-coordinated halides. The in vitro antimicrobial activities of the ligand and complexes were elaborated by screening them against Gram(+) bacteria (Streptococcus pyogenes), Gram(-) bacteria (Pseudomonas aeruginosa), and a fungus (Candida albicans). All compounds showed weak activity against the tested bacterial and fungal strains.

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Ndiolene, A.; Diop, T.; Boye, M. S.; Faure, B.; Diasse-Sarr, A.; Giorgi, M. Synthesis, Characterization, and Antimicrobial Activity of Cu(II) and Zn(II) Complexes With N,N-bis(4-methoxybenzylidene)ethylenediamine or N-(4-methoxybenzylidene)ethylenediamine Schiff Base. Eur. J. Chem. 2025, 16, 169-177.

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