Abstract
The hydrazinium lanthanide metal complexes of 2-pyrazinecarboxylic acid (HpyzCOO) of the formulae (N2H5)2[Ln(pyzCOO)5]·2H2O, where Ln=La or Ce and (N2H5)3[Ln(pyzCOO)4(H2O)]·2NO3, where Ln=Pr, Nd, Sm or Dy have been synthesized by the addition of an aqueous solution of the corresponding metal nitrate hydrates to an aqueous mixture of the respective carboxylic acids and hydrazine hydrate. The in vitro antibacterial screening of the free acid and its metal complexes has been carried out against Escherichia coli, Salmonella typhi and Vibrio cholerae. Antifungal activities of all the synthesized compounds were screened for in vitro growth inhibitory activity against Aspergillus fumigatus and Aspergillus niger by using the disc diffusion method. The antimicrobial activities of the prepared metal complexes show more promising activity than the corresponding free acid, its hydrazinium salts, and the standard control antibiotics, Co-trimoxazole and Carbendazim.
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