Abstract
A series of macrocyclic complexes of the type [M(L/L')(NO 3 ) n ].mH 2 O and [VO(L/L')(SO 4 )].2H 2 O, 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 = UO 2 (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 1 H-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; UO 2 (VI) and ZrO(IV) ions are hexa-coordinated where as Th(IV) ion is octa-coordinated yielding diamagnetic complexes of above composition.
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