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Cobalt (II) complexes of various thiosemicarbazones of 4-aminoantipyrine: syntheses, spectral, thermal and biological studies

Prasad, Surendra and Agarwal, Ram K. (2007) Cobalt (II) complexes of various thiosemicarbazones of 4-aminoantipyrine: syntheses, spectral, thermal and biological studies. Transition Metal Chemistry, 32 (2). pp. 143-149. ISSN 0340-4285

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Abstract

An interesting series of cobalt(II) complexes of the new ligands: 4[N-(benzalidene)amino]antipyrinethiosemicarbazone (BAAPTS), 4[N-(2′-hydroxy-benzalidene)amino]antipyrinethiosemicarbazone (HBAAPTS) and 4[N-(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.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Ms Mereoni Camailakeba
Date Deposited: 24 May 2007 16:00
Last Modified: 29 Aug 2012 13:18
URI: http://repository.usp.ac.fj/id/eprint/822
UNSPECIFIED

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