European Journal of Chemistry 2011, 2(2), 178-188 | doi: https://doi.org/10.5155/eurjchem.2.2.178-188.240 | Get rights and content

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Spectroscopic and biological activity studies on tridentate Schiff base ligands and their transition metal complexes


Hanan Farouk Abd El-Halim (1,*) , Mohamed Mohamed Omar (2) , Gehad Genidy Mohamed (3) , Mohsen Abou El-Ela Sayed (4)

(1) Pharmaceutical Chemistry Department, Faculty of Pharmacy, Misr International University, Cairo, Heliopolis, 11341, Egypt
(2) Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt
(3) Chemistry Department, Faculty of Science, Cairo University, Giza, 12613, Egypt
(4) Department of Botany, Faculty of Science, Cairo University, Giza 12613, Egypt
(*) Corresponding Author

Received: 08 Aug 2010 | Revised: 24 Feb 2011 | Accepted: 05 Jan 2011 | Published: 30 Jun 2011 | Issue Date: June 2011

Abstract


Schiff base ligands are prepared via condensation of pyridine-2,6-dicarboxaldehyde with 2-aminothiophenol (H2L1) and 2-aminobenzoic acid (H2L2), respectively. The ligands are characterized based on elemental analysis, mass, IR and 1H NMR spectra. Metal complexes are reported and characterized based on elemental analyses, IR, 1H NMR, solid reflectance, magnetic moment, molar conductance, and thermal analyses (TG, DTG and DTA). The molar conductance reveals that all the metal chelates are non-electrolytes except Th(IV) H2L2 complex which is 1:1 electrolyte . IR spectra show that H2L1 and H2L2 ligands behave as neutral tridentate ligands and bind to the metal ions via the two azomethine N and pyridine N. From the magnetic and solid reflectance spectra, it is found that the geometrical structures of these complexes are octahedral (Cr(III)- and Fe(III)-H2L1 and H2L2, Th(IV)-H2L2 and Mn(II)-H2L1 complexes) and triagonal bipyramidal (Co(II), Ni(II), Cu(II), Cd(II) and UO2(II)-H2L1 and H2L2 and Mn(II)-H2L2 complexes). The thermal behaviour of these chelates is studied using TG and DTA techniques and the activation thermodynamic parameters are calculated using Coats-Redfern method. The synthesized ligands and their metal complexes were screened for their biological activity against bacterial species (Escherichia coli, P. vulgavis, B. subtilis and S. pyogones) and fungi (F. solani, A. niger and A. liavus). The activity data show that the metal complexes have antibacterial and antifungal activity more than the parent Schiff base ligands against one or more bacterial or fungi species.2_2_178_188_800

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Keywords


Schiff bases; Transition metal complexes; Spectral studies; Thermal analyses; Biological activity; Potentiometric measurements

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DOI: 10.5155/eurjchem.2.2.178-188.240

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How to cite


Abd El-Halim, H.; Omar, M.; Mohamed, G.; El-Ela Sayed, M. Eur. J. Chem. 2011, 2(2), 178-188. doi:10.5155/eurjchem.2.2.178-188.240
Abd El-Halim, H.; Omar, M.; Mohamed, G.; El-Ela Sayed, M. Spectroscopic and biological activity studies on tridentate Schiff base ligands and their transition metal complexes. Eur. J. Chem. 2011, 2(2), 178-188. doi:10.5155/eurjchem.2.2.178-188.240
Abd El-Halim, H., Omar, M., Mohamed, G., & El-Ela Sayed, M. (2011). Spectroscopic and biological activity studies on tridentate Schiff base ligands and their transition metal complexes. European Journal of Chemistry, 2(2), 178-188. doi:10.5155/eurjchem.2.2.178-188.240
Abd El-Halim, Hanan, Mohamed Mohamed Omar, Gehad Genidy Mohamed, & Mohsen Abou El-Ela Sayed. "Spectroscopic and biological activity studies on tridentate Schiff base ligands and their transition metal complexes." European Journal of Chemistry [Online], 2.2 (2011): 178-188. Web. 30 May. 2023
Abd El-Halim, Hanan, Omar, Mohamed, Mohamed, Gehad, AND El-Ela Sayed, Mohsen. "Spectroscopic and biological activity studies on tridentate Schiff base ligands and their transition metal complexes" European Journal of Chemistry [Online], Volume 2 Number 2 (30 June 2011)

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