Cobalt(II) complexes of various thiosemicarbazones of 4-aminoantipyrine: syntheses,spectral, thermal and antimicrobial studies |
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Authors: | Surendra Prasad Ram K Agarwal |
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Institution: | (1) Department of Chemistry, SBCES, Faculty of Science and Technology, The University of the South Pacific, Suva, Fiji;(2) Department of Chemistry, Lajpat Rai Postgraduate College, Sahibabad (Ghaziabad), 201005, India |
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Abstract: | An interesting series of cobalt(II) complexes of the new ligands: 4N-(benzalidene)amino]antipyrinethiosemicarbazone (BAAPTS), 4N-(2′-hydroxy-benzalidene)amino]antipyrinethiosemicarbazone (HBAAPTS) and 4N-(2′-hydroxy-1′-naphthalidene)amino]antipyrinethiosemicarbazone (HNAAPTS) were synthesized by reaction with Co(II) salts in
ethanol. The general stoichiometry of the complexes was found to be CoX2(H2O)(L)] and Co(L)2](ClO4)2, where X = Cl, NO3, NCS or CH3COO and L = BAAPTS, HBAAPTS or HNAAPTS. The complexes were characterized by elemental analysis, molar conductivity measurement,
molecular weight determination, magnetic moments at room temperature, infrared and electronic spectra. All the thiosemicarbazones
behave as neutral tridentate (N, N, S) donor ligands. The conductivity measurements in PhNO2 solution indicated that the chloro, nitrato, thiocyanato and acetate complexes are essentially non-electrolytes, while the
perchlorate complexes are 1:2 electrolytes. Thermogravimetric studies were performed for some representative complexes and
the decomposition mechanism proposed. Antibacterial and antifungal properties of the ligands and their cobalt(II) complexes
have also been examined and it has been observed that the complexes are more potent bactericides than the ligand. |
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