Abstract
A new class of mixed ligand complexes of uranium(VI) is reported. The complexes have the stoicheiometry [UO 2 L( A)], where L is a potentially tridentate or quadridentate Schiff base anion and A is an anion which may act as unidentate or bidentate ligand. The configurations of these complexes have been investigated by means of 1H NMR, i.r. and u.v. spectroscopy. The complexes contain hepta-coordinated uranium with irregular pentagonal bipiramidal geometry. Conductivity measurements indicate that the complexes are non-electrolytes even in the presence of a large excess of triphenylphosphine oxide. Studies on the relative stabilities of the UA bonds are reported. The influence of the anion on the stretching frequency of the NH group of the Schiff base and on the antisymmetric stretching mode ( v 3) of the OUO group has been determined.
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