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Mn(II) and Cu(II) metal complexes with bisamine based bidentate ligand. Spectroscopic investigation, biological activity and gamma ray irradiation impact

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Published/Copyright: July 9, 2025

Abstract

Mononuclear [Mn(L)Cl2(H2O)2].1½H2O (1), [Cu(L)Cl2(H2O)2] (2) and [Cu(L)Br2(H2O)2].2H2O (3) complexes were obtained via reaction of N,N’-(1,2-phenylene)bis (2-aminobenzamide (L) with Mn(II), Cu(II) halides, respectively. The structure of these metal chelates were confirmed using the various microanalyses and physiochemical tools as molar conductance, FT–IR spectra, thermogravimetric analysis (TG/DTG), UV–Vis, EPR, magnetic moment measurements, 3D molecular modeling and X–ray diffraction. The ligand forms hexacoordinated complexes having octahedral stereochemistry for all complexes. Gamma ray irradiation was applied to solid samples of complexes to examine the possible structure changes with γ–ray exposures (hereafter pointed to as 1A, 2A, 3A, respectively). The physical and chemical changes observed for γ–irradiated samples were examined by the same tools utilized for the as-prepared complexes. Spectroscopic results showed distortion of complex structure by γ–ray irradiation. TG/DTG results indicated that, thermal stability for all irradiated samples is not greatly affected by the applied γ-ray irradiation dose. The thermodynamic properties of the decomposition processes (E a , A, ΔH*, ΔS*, and ΔG*) were calculated from TGA using the Coats-Redfern equations. The results of XRD showed that, all samples are in nanoscale size and γ-ray irradiation altered the crystallite size. Also, dc solid-state electrical conductivity was performed and the activation energy were computed. Furthermore, the in vitro antimicrobial property for the ligand and all complexes before and after irradiation have been tested. The results showed that some complexes possessed good activity and irradiation enhanced the bioactivity of some complexes.


Corresponding authors: Hanaa A. El-Boraey, Department of Chemistry, Faculty of Science, Menoufia University, Shebin El-Kom, 32511, Egypt, E-mail: ; and Ohyla A. El-Gammal, Department of Pathology, University Hospital, Menoufia University, Shebin El-Kom, 32511, Egypt, E-mail:

  1. Research ethics: Not applicable.

  2. Informed consent: Not applicable.

  3. Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission. Hanaa A. El-Boraey: writing – review and editing, visualization, supervision. Azza A. Serag El-Din: writing – original draft, data curation. Ahmed A. Sakr: methodology, funding acquisition, formal analysis, writing – original draft. Ohyla A. EL-Gammal: writing – review and editing, writing – original draft, visualization, data curation, conceptualization.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interest: The authors state no conflict of interest.

  6. Research funding: No funding was received for this work.

  7. Data availability: The data can be obtained in the Supplementary materials.

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Supplementary Material

This article contains supplementary material (https://doi.org/10.1515/ract-2025-0034).


Received: 2025-03-10
Accepted: 2025-05-29
Published Online: 2025-07-09
Published in Print: 2025-09-25

© 2025 Walter de Gruyter GmbH, Berlin/Boston

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