Synthesis, Characterization, Thermal and Biotoxic Studies of Phenylhydrazine Complexes of Metal(II) Phthalates

Abstract

Phenylhydrazine complexes of metal(II) phthalates of the general formula [M(C₈H₄O₄)(C₆H₅NHNH₂)₂(H₂O)₂], where M=Mn(II), Fe(II), Co(II), Ni(II), Zn(II) or Cd(II), were prepared and characterized by elemental analyses, magnetic and spectral studies. The thermal decomposition behavior of the cobalt(II) complex was studied and the kinetic parameters for the decomposition reactions were evaluated according to the Coats‐Redfern, Horowitz‐Metzger and MacCallum‐Tanner methods. Slightly distorted octahedral geometries were established for the complexes with water molecules in the coordination sphere. The monodentate behavior of phenylhydrazine molecule was established. The thermal decomposition pattern of the cobalt(II) complex was characteristic of the proposed structure. Biotoxic studies revealed marked antifungal and antibacterial effects for several complexes.

Keywords:

• Biotoxic studies
• characterization
• metal(II) phthalate phenylhydrazine complexes
• thermal studies

Acknowledgments

The authors thank Dr. M.P. Kannan, Professor and former Head, Department of Chemistry, University of Calicut. Financial assistance of the University Grants Commission of India is gratefully acknowledged.