Some new hydrazinium salts of 2-pyrazinecarboxylate, 2,3-pyrazinedicarboxylate, 3,5-pyrazoledicarboxylate and 4,5-imidazoledicarboxylate have been prepared. The in vitro antibacterial screening of the free acids and their hydrazinium salts has been carried out against Escherichia coli, Salmonella typhii and Vibrio cholerae. The antibacterial activities of the prepared hydrazinium salts show more promising activity than the corresponding free acids and the standard positive control antibiotic, Co-trimoxazole.

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Hydrazinium lanthanide complexes of formula N,H,Ln(SO,),-H,O, where Ln = La, Ce, Pr, Nd, or Sm, have been prepared and investigated by means of i.r. and electronic spectroscopy, thermal analysis, and magnetic susceptibility measurements. The crystal structure of the neodymium compound has been determined by conventional Patterson and Fourier methods and refined by fullmatrix least squares t o an R of 0.059 for 2 427 independent reflections. The t w o independent neodymium atoms in the asymmetric unit are nine-co-ordinated by seven sulphate oxygen atoms, one water molecule, and one nitrogen atom of the N, H, + ion. The co-ordination polyhedron in both the cases is a distorted tricapped trigonal prism. The sulphate groups are present as bridging ligands among three metal atoms. Powder patterns indicate isomorphism of the above series of compounds.

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