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Syntheses, characterization and X-ray crystal structures of Co(III) and Mn(II) complexes of pyrimidine derived Schiff base ligands

Roy, Somnath and Mandal, Tarak Nath and Barik, Anil Kumar and Gupta, Samik and Butcher, Ray J and Nethaji, Munirathinam and Kar, Susanta Kumar (2008) Syntheses, characterization and X-ray crystal structures of Co(III) and Mn(II) complexes of pyrimidine derived Schiff base ligands. In: Polyhedron, 27 (2). pp. 593-601.

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Abstract

Two pyrimidine based NNS tridentate Schiff base ligands S-methyl-3-((2-S-methyl-6-methyl-4-pyrimidyl)methyl)dithiocarbazate $[HL_1]$ and S-benzyl-3-((2-S-methyl-6-methyl-4-pyrimidyl)methyl)dithiocarbazate $[HL_2]$ have been synthesised by 1:1 condensation of 2-S-methylmercapto-6-methylpyrimidine-4-carbaldehyde and S-methyl/S-benzyl dithiocarbazate. One Co(III) and one Mn(II) complex of $HL_1$ and one Mn(II) complex of $HL_2$ have been prepared and characterized by elemental analyses, molar conductivities, magnetic susceptibilities and spectroscopic studies. All the bis-chelate complexes have a distorted octahedral arrangement with an $N_4S_2$ chromophore around the central metal ion. Each ligand molecule binds the metal ion using pyrimidyl nitrogen, azomethine nitrogen and the thiolato sulfur atoms. In the free ligand moieties, the pyrimidine nitrogen atoms, azomethine nitrogen atoms and thione sulfur atoms are in EEE orientation to each other. During chelation, all the donor sites of the ligands are reoriented to ZEZ configuration in order to facilitate the chelation process. In all the complexes, the respective ligand molecule functions as the monoanionic tridentate one. All complexes were analyzed by single crystal X-ray diffraction and significant differences concerning the distortion from octahedral geometry of the coordination environment were observed.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Ltd.
Keywords: Cobalt(III) and manganese(II) complexes;Pyrimidine derived dithiocarbazate ligands;X-ray structures;Spectroscopy
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 27 Mar 2008
Last Modified: 19 Sep 2010 04:43
URI: http://eprints.iisc.ernet.in/id/eprint/13507

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