Synthesis, Thermal and Spectral Studies of Mn(II), Co(II), Cu(II) and Zn(II) Complexes of Cinnamaldehydeanthranilic Acid

Abstract

Complexes of Mn(II), Co(II), Cu(II) and Zn(II) with Schiff base formed
by condensation of cinnamaldehyde and anthranilic acid have been
synthesized and their physicochemical properties have been investigated
by elemental analysis, magnetic measurement, molar conductance, electronic
spectroscopy, infrared spectroscopy and thermal studies. The ligand
was found to be bidentate chelating agent for the metal ions. Thermal
decomposition data of the complexes have been analyzed to obtain the
activation energy, entropy of activation and frequency factor based on
Coats-Redfern equation. The relative thermal stability of the chelates can
be given as [MnLOAc(H₂O)₃]  ≈ [ZnLOAc(H₂O)] < [CoLOAc(H₂O)₃] <
[CuLOAc(H₂O)].