SYNTHESIS, CHARACTERIZATION AND ANTIMICROBIAL ACTIVITY OF A Pd(II) COMPLEX WITH A 1,3-DIPHENYLPYRAZOLE-4-CARBOXALDEHYDE THIOSEMICARBAZONE LIGAND

Abstract

This article describes the synthesis and characterization of a new complex, [Pd(Ph2PzTSC)2], formed between palladium(II) and 1,3-diphenylpyrazole-4-carboxaldehyde thiosemicarbazone ligand as a strategy for antimicrobial activity improvement the synthesized complex. The metal coordination leads to an improvement of ligand pharmacological activities and synergistic effects involving both metal ion as the ligand. The bidentate ligand is coordinated to metal ion through the azomethine nitrogen atoms and the sulphur in the form of thiol by deprotonation of the NH-C=S group. The antimicrobial activity of these new compounds was evaluated against gram-negative (Escherichia coli, Klebsiella pneumoniae and Pseudomonas aeruginosa) and gram-positive (Staphylococcus aureus and Bacillus thuringiensis) bacteria and two yeasts strains (Candida albicans and Saccharomyces cerevisiae). A comparison between the antimicrobial activity of the complex and that of the free ligand revealed that the coordination of Pd(II) improved the activity