Synthesis, Characterization, Thermal Decomposition and Antifungal Studies of Cr(III), Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) Complexes of N,N′-bis[1,3-benzodioxol-5ylmethylene]ethane-1, 2-diamine

Abstract

A bidentate/tetradentate Schiff base namely, N,N′-bis[1,3benzodioxol-5-ylmethylene] ethane-1,2-diamine was synthesized by condensing piperonaldehyde (3,4-dioxymethylenebenzaldehyde) with ethylenediamine. Cr(III), Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) complexes of this chelating/bridging ligand were synthesized using acetates, chlorides, bromides, nitrates and perchlorates of these metals. The ligand and the complexes were characterized by elemental analysis, ¹H NMR, UV-vis and IR spectra, conductance and magnetic susceptibility measurements and thermogravimetric analysis. The ligand showed bridging nature in some of its complexes, as evidenced by magnetic- and microanalytical data. The thermograms of three complexes were analyzed and the kinetic parameters for the different stages of decompositions were determined. The antifungal activities of the ligand and some of its complexes against Phytophthora capsici were tested in carrot agar medium.

Keywords:

• antifungal activity
• diamine
• piperonal
• Schiff base
• thermal decomposition
• transition metal complexes

Notes

*s-strong, m-medium, w-weak, b-broad, sh-shoulder

*s-strong, m-medium, w-weak, b-broad, sh-shoulder

*s-strong, m-medium, w-weak, b-broad, sh-shoulder.

*Temperature range of significant mass-loss in the stage