B. Gupta, W. Malik
Mar 1, 1969
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Journal
Journal of The Less Common Metals
Abstract
Abstract The reactions of 2-hydroxy-5-methylacetophenone with uranium(VI) and thorium(IV) have been studied by both colorimetric and conductometric methods. The reactions are instantaneous and take place in acidic media. Uranyl ions develop an orange colour and thorium ions a yellow colour with this reagent. The solutions are highly stable and their colour intensity remains unchanged, even on keeping for a week or so. Temperature variations up to 80°C have no effect on their colour intensity. Application of Vosburgh and Cooper's method demonstrates the formation of only one complex in each reaction. The composition of the complexes has been determined by both Job's method of continued variation and the slope ratio method. The reagent forms a 2:1 complex with uranium and a 1:1 complex with thorium. The values of the stability constants of the uranium and thorium complexes are calculated to be 1.4 × 10 7 and 2.66 × 10 2 and − ΔG ° to be 9.91 and 3.35 kcal/mol at 30°C, respectively.