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KMID : 1059520100540040395
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Journal of the Korean Chemical Society
2010 Volume.54 No. 4 p.395 ~ p.401
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Synthesis and Characterization of UO2(VI), Th(IV), ZrO(IV) and VO(IV) Complexes with Schiff-Base Octaazamacrocyclic Ligands
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Mohapatra, Ranjan Kumar
Dash, Dhruba Charan
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Abstract
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A series of macrocyclic complexes of the type [M(L/L’)(NO₃)n].mH₂O and [VO(L/L’)(SO₄)].2H₂O , where L/L’ is a Schiff base "3,4,10,11-tetraphenyl/tetramethyl-1,2,5,6,8,9,12,13-octaaza cyclotetradeca-2,4,9,11-tetraene-7,14-dithione" derived from thiocarbohydrazide (TCH), benzilmonohydrazone (BMH)/diacetylmonohydrazone (DMH) and carbon disulphide, M = UO₂(VI), Th(IV) and ZrO(IV), n = 2, 4, m = 2, 3, have been synthesized via metal ion template methods. The complexes are characterized on the basis of elemental analysis, thermal analysis, molar conductivity, magnetic moment, electronic, infrared and ¹H-NMR spectral studies. The ESR and cyclic voltammetry studies of the vanadyl complexes have been carried out. The results indicate that the VO(IV) ion is penta-coordinated yielding paramagnetic complexes; UO₂(VI) and ZrO(IV) ions are hexacoordinated where as Th(IV) ion is octa-coordinated yielding diamagnetic complexes of above composition.
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KEYWORD
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Schiff base, Template synthesis, Structure and thermal properties, Spectral analysis, Cyclic voltammetry
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