EXAFS STRUCTURAL ANALYSIS OF AQUEOUS URANIUM(VI) COMPLEXES WITH WOOD DEGRADATION PRODUCTS


EXAFS STRUCTURAL ANALYSIS OF AQUEOUS URANIUM(VI) COMPLEXES WITH WOOD DEGRADATION PRODUCTS

Rossberg, A.; Baraniak, L.; Reich, T.; Hennig, C.; Bernhard, G.; Nitsche, H.

Uranium LIII-edge EXAFS analysis was carried out on aqueous uranium(VI) complexes with monomeric intermediates of the natural wood-degradation process such as protocatechuic acid (3,4-dihydroxy-benzoic acid), catechol (2-hydroxyphenol), pyrogallol (1,2,3-trihydroxybenzol), and vanillic acid (4-hydroxy-3-methoxybenzoic acid). The structural parameters of the 1:1 complexes with protocatechuic acid and vanillic acid indicate that the carboxylic group coordinates the uranyl cation in a bidentate mode in the equatorial plane. Based on the identical structural parameters observed for all complexes in alkaline media, except for vanillic acid, we conclude that the coordination occurs via the neighboring OH groups of the phenols under formation of a five-membered ring.

  • Radiochimica Acta 88, 593-597 (2000)

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