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Four novel Cr (III), Co (II) and Ni (II) complexes with 2-thiazoline-2-tiol derivative ligands were synthesized and characterized using elemental, physiochemical, and spectroscopy analytical methods. the results showed the formation of ligands coordinated by sulfur atoms of the C = S bond to the l1 ligand and by the sulfur atom of the C-S bond and/or nitrogen of the intra C-ring bond of the l2 ligand. the activity of the complexes against Gram-negative, Gram-positive bacteria and yeasts of clinical importance was evaluated by broth microdilution method. the best result was obtained to l2-Ni compound against E. cloacae (Minimal Inhibitory Concentration (MIC) = 62.5 μg/ml). Additionally, the compounds showed anti-Candida activity (MIC values ranging from 250 to 500 μg/ml), except the l1-Cr that was not active against any tested microorganism.

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Synthesis, characterization and antimicrobial activity of Cr (III), Co (II) and Ni (II) complexes with 2-thiazoline-2-tiol derivative ligands against bacteria and yeasts of clinical importance