Effect of substituants on the structure of dioxouranium(VI) complexes of 7-carboxaldehyde-8-hydroxyquinoline and some of its Schiff bases |
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Authors: | Ali El-Dissouky Adel Z El-Sonbati |
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Institution: | (1) Chemistry Department, Faculty of Science, United Arab Emirates University, P.O. Box 15551, Al-Ain, United Arab Emirates;(2) Chemistry Department, Faculty of Education, Damietta, Egypt |
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Abstract: | Summary A series of dioxouranium(VI) complexes with 7-carboxaldehyde-8hydroxyquinoline (oxine) and with some of its Schiff bases, LH, have been prepared and characterized by elemental analyses, electronic and vibrational spectral studies. All complexes except those of the oxine have the UO2L2] · EtOH, stoichiometry (n=0, 1, 2 or 4). The uranyl complexes of the oxine have the formula UO2L2(LH)]. The i.r. spectra reveal all ligands to be monobasic bidentate chelating agents coordinated to the uranium(VI)via the enolized phenolic OH and aldehydic oxygen or azomethine nitrogen atom. The force constant fU-o (mdyn Å) and the bond length rU-o (Å) of the U-O bond are also calculated and related to the electronic properties of thep-substituents. |
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