Spectral, Thermal, X-Ray and Antimicrobial Studies of Newer Tetradentate N2O2 Schiff Base Complexes of First Transition Series

Asymmetrical tetradentate complexes of Mn(II), Fe(III), Co(II), Ni(II) and Cu(II) of Schiff bases which are synthesized from o-phenylenediamine, 3-Acetyl-6-methyl-pyran-2, 4-dione and 5-bromo salicylaldehyde have been synthesized. The structures of ligands and complexes are characterized by elemental analysis, magneticsusceptibility, thermal analysis, X-ray diffraction, ¹H-NMR, mass, IR, UV-visible spectra, and conductometry. TGA/DSC spectral and kinetic parameter of the complexes was observed keenly. The ligand field parameters have been characterized for Mn(II), Fe(III), Co(II), complexes, which recommend octahedral geometry, and square planar geometry for Ni(II) and Cu(II). The X-ray diffraction data proposes monoclinic crystal system for all five complexes. The ligand and their metal complexes were subjected for antibacterial activity against Escherichia coli and Staphylococcus aureus and fungicidal activity against Trichoderma and Aspergillus Niger.

Author(s): Shyam R Annapure, Achut S Munde, Shantilal D Rathod

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