1. Complex formation of uranium(VI) with 4-hydroxy-3-methoxybenzoic acid and related compounds.
- Author
-
Vulpius, D., Geipel, G., Baraniak, L., Rossberg, A., and Bernhard, G.
- Subjects
- *
URANIUM , *BENZOIC acid , *COORDINATION compounds , *ANIONS , *X-ray diffraction - Abstract
The complex formation of uranium(VI) with 4-hydroxy-3-methoxybenzoic acid as well as with benzoic acid and 4-hydroxybenzoic acid was studied. In aqueous solution weak carboxylic 1 : 1 complexes, are formed in which the carboxyl group is bidentately coordinated to the metal atom. The logarithmic stability constants of these complexes regarding the reaction of the uranyl ion with the single charged anion of the respective ligands are 2.78±0.02, 2.68±0.04, and 2.71±0.04 at an ionic strength of 0.1 mol/l (NaClO4) and at 25 °C. Bis(4-hydroxy-3-methoxybenzoato)dioxouranium(VI) was obtained as a crystalline compound if the concentrations of the starting components for the synthesis are increased. The monoclinic compound has a reflections-rich X-ray powder diffraction pattern. The lattice constants are a = 13.662(9) Å, b = 21.293(7) Å, c = 11.213(3) Å, b = 107.49(4), and V = 3111(2) Å.3 [ABSTRACT FROM AUTHOR]
- Published
- 2006
- Full Text
- View/download PDF