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Synthesis and characterization of two tris-chelate complexes of cobalt(III) with 3,5-dimethyl-1-(N-methyl/ethyl)thiocarbamylpyrazole (HL 1 , HL 2 ) - Biologically important bidentate ligands with one ambidentate donor site
A K BARIK, S PAUL, R J BUTCHER, S K KAR
Published in Elsevier Ltd
2000
Volume: 19
   
Issue: 28
Pages: 2651 - 2655
Abstract
Cobalt(III) complexes, of two potentially pyrazole-derived bidentate ligands (with one ambidentate donor site), 3,5-dimethyl-1-(N-methyl/ethyl)thiocarbamylpyrazole (HL 1 for N-methyl, HL 2 for N-ethyl) have been synthesized and characterized by elemental analyses, IR, UV-Vis and 1 H NMR spectral studies. The structure of Co(L 2 ) 3 has been determined by single-crystal X-ray diffraction studies. The complex (triclinic, space group P1) has a distorted octahedral structure with the ambidentate ligands coordinated to the Co(III) ion as uninegative bidentate chelating agents via the pyrazole ring nitrogen (tertiary) and the thiocarbamyl iminyl nitrogen atoms. The distortion from the regular octahedral geometry is ascribed to the stereochemical limitations imposed by the planar bidentate ligands. © 2000 Elsevier Science B.V.
About the journal
JournalData powered by TypesetPolyhedron
PublisherData powered by TypesetElsevier Ltd
ISSN0277-5387