Paper
Synthesis, Spectroscopic Characterization and Antimicrobial Activities of Some Rare Earth Metal Complexes of Biologically Active Asymmetrical Tetradentate Ligand
- Authors:
- T. K. Chondhekar; Sunil G. Shankarwar; Sarika M. Jadhav; Vinod A. Shelke
- Abstract
- The solid complexes of La(III), Ce(III), Pr(III), Nd(III), Sm(III) and Gd(III) with asymmetrical tetradentate Schiff bases derived from 4-methyl-o-phenylenediamine, 3-Acetyl-6-methyl-pyran-2,4-dione and 2-hydroxy-1-naphthaldehyde have been synthesized and characterized by elemental analysis, conductometry, magnetic susceptibility, UV-visible, FTIR, 1H-NMR spectra, X-ray diffraction, thermal analysis and screened for antimicrobial activity. The IR spectral data suggest that the ligand behaves as a dibasic tetradentate ligand with ONNO donor atoms sequence towards central metal ion. From the microanalytical data, the stoichiometry of the complexes has been found to be 1:1 (metal: ligand). The X-ray differaction data suggest tetragonal crystal system for La(III) complex and orthomboic crystal system for Ce(III) complex. Thermal behaviour (DSC/TGA) of the complexes was studied and kintic parameters were determined by Horowitz-Metzger and Coats-Redfern method. The ligand and their metal complexes were screened for antibacterial activity against Staphylococcus aureus and Escherichia coli and fungicidal activity were tested against Aspergillus Niger and Trichoderma.
- Keywords
- Dehydroacetic Acid; Unsymmetrical Tetradentate Schiff Base; Rare Earth Metal Complexes; Thermal Analysis; Antimicrobial Activity
- StartPage
- 61
- EndPage
- 69
- Doi