Abstract

Objective - Literature survey indicates that hydrazine the simplest diamine, is known to form fairly stable complexes with mineral and carboxylic acids. Among the different substituted dicarboxylic acids, the potential tridentate α-amino dicarboxylic acid such as aspartic acid has been found to exhibit a strong interaction towards metal ions. Though the interaction of aspartic acid with aromatic amines, imidazole, bipyridine and phenanthroline towards various metals has been well studied, the studies with simple diamine, hydrazine with the metals in the medium of aspartic acid however have not yet been established. Hence objective is to prepare metal hydrazine / hydrazinium α-amino dicarboxylates and to study its elemental analysis, thermal decomposition patterns, isomorphism, and hence to propose the structrure, and also to study the bactericidal  activities of the ligands.

Design / Methodology/ Approach- The present paper is based on primary data. These complexes were characterized by different physico-chemical studies and tested for their toxicity towards bacteria.

 Findings- New aspartate complexes of some transition metals with hydrazinium cation, N2H5M(Asp)1.50.5H20  where M= Co, Ni, Zn or Cd have been prepared. The complexes were found to be octahedron around each metal ion. The dicarboxylic acids are dianionic in nature  and contains non-coordinated hydrazinium cation. Water is present as a lattice molecule. Mostly, all the complexes undergo two step decomposition yielding metal oxide as the final residue. The complexes are isomorphous, not only within, but also in between the series. Most of the tested compounds are effective bactericides.

Practical implications- Detailed study on biocidal activities makes the compound use as an effective bactricides.

Scope for future work- Various biological studies can be carried out using these complexes

Key words: Aspartic acid, hydrazine, TG-DTA , XRD and biocidal activities.