Dioxouranium(VI) thiocyanate complexes of schiff bases of p-nitro,chloro, bromo,hydroxy and methoxy aniline and salicylaldehyde |
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| Authors: | Wissam I Azeez Ali I Abdulla |
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| Institution: | Department of Chemistry, College of Science, University of Mosul, Mosul, Iraq |
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| Abstract: | A series of dioxouranium(VI) complexes was synthesised with some Schiff base ligands containing substituent groups at para positions to CHN groups. These molecules were obtained by the condensation of para-nitro, chloro, bromo, hydroxy, methyl and methoxy aniline with salicylaldehyde. The bidentate ligands formed complexes of the type UO2(NCS)2 (X-N-Sal)n·mH2O, where n = 2, m = 3, x = NO2, Cl, Br and OH; n = 3, m = 2, x = CH3 and OCH3.Conductivity measurements indicate that all the complexes are non-electrolytes in nitromethane solution, whereas in DMF they correspond to 1:1 electrolytes.IR spectral data suggest that the molecules and not the anions of the Schiff base are coordinated to the central uranium atom. IR and Raman spectra suggest that the complexes UO2(NCS)2(X-N-Sal)2· 3H2O (X = NO2, Cl, Br) have C2h molecular symmetry, whereas UO2(NCS)2(X-N-Sal)3·2H2O (X = OCH3, CH3) have C2v symmetry.The frequencies of UO2(asym) (IR) and UO2(sym) (R) in the complexes seem to vary with the various substituents of the Schiff base ligand, in the order:NO2 > Cl > Br > OH > CH3 > OCH3 |
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| Keywords: | Authors to whom correspondence should be addressed |
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