Abstract
Three new 2-pyrral amino acid Schiff base palladium (II) complexes were synthesized, characterized and their activity against six bacterial species was investigated. The ligands: Potassium 2-pyrrolidine-L-methioninate (L1), Potassium 2-pyrrolidine-L-histidinate (L2) and Potassium 2-pyrrolidine-L-tryptophanate (L3) were synthesized and reacted with dichloro(1,5-cyclooctadiene)palladium(II) to form new palladium (II) complexes C1, C2 and C3, respectively. 1H NMR, FTIR, UV–Vis, elemental analysis and conductivity measurements were used to characterize the products. The antibacterial activities of the compounds were evaluated against Gram-positive Staphylococcus aureus (S. aureus, ATCC 25923), methicillin-resistant Staphylococcus aureus (MRSA, ATCC 33591), Staphylococcus epidermidis (S. epidermidis, ATCC 12228) and Streptococcus pyogenes (S. pyogenes, ATCC 19615) and, gram-negative Pseudomonas aeruginosa (P. aeruginosa, ATCC 27853) and Klebsiella pneumoniae (K. pneumoniae, ATCC 13883) using the agar well diffusion assay and microtitre plate serial dilution method. The palladium complexes were active against the selected bacteria with the imidazole ring containing complex C2 and indole heterocyclic ring containing complex C3 showing the highest activity.
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Acknowledgements
We would like to thank Jomo Kenyatta University of Agriculture and Technology in Kenya for granting Dr. Eunice Nyawade study leave to undertake this study at the University of the Western Cape, South Africa. We would also like to thank the UWC for allowing us to use their chemistry laboratory to do the synthesis and characterization work, and DST/Mintek Nanotechnology Innovation Centre for perfoming the antibacterial studies.
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This work was supported by the National Research Foundation, South Africa.
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Nyawade, E.A., Onani, M.O., Meyer, S. et al. Synthesis, characterization and antibacterial activity studies of new 2-pyrral-L-amino acid Schiff base palladium (II) complexes. Chem. Pap. 74, 3705–3715 (2020). https://doi.org/10.1007/s11696-019-00986-5
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DOI: https://doi.org/10.1007/s11696-019-00986-5