REACTION OF THE URANYL ION WITH AMINO ACIDS. BIDENTATE CARBOXYLATE CHELATION

Technical Report · Fri May 18 04:00:00 EDT 1962

OSTI ID:4807718

Feldman, I; Koval, L

Stability constants determined by the pH method for 1: 1 complexes of the uranyl ion with acetate, acid succinate, aspartate and glutamate ions in acid solution at 25 deg C and mu = 0.2 all have practically the same value, log/sub 10/K/sub 1/ between 2.61 and 2.70. These results are interpreted as being due primarily to the fact that in each case complexing involves only bidentate carboxylate chelation, which produces significantly less steric hindrance than is present in either uncomplexed, hydrated uranyl ion or in other possible chelate structures. The concept of bidentate acetate chelation of the uranyl ion is also used to explain the apparent anomaly that pK/sub 1/ for the uranyl--acetate complex is as high as pK/sub 1/ for the uranyl--glycolate chelate. Precipitation studies from pH 3 to 8 indicate that both carboxyl and imidazole nitrogens are probably involved in protein binding of the uranyl ion, but that binding by alpha amino groups is insignificant, probably for steric reasons. (auth)

• Research Organization: Rochester, N.Y. Univ. Atomic Energy Project
• NSA Number: NSA-16-023387
• OSTI ID: 4807718
• Report Number(s): UR-611
• Country of Publication: United States
• Language: English

Related Subjects

ACIDITY
AMINO ACIDS
BIOCHEMISTRY
BIOLOGY AND MEDICINE
CHELATES
CHEMICAL REACTIONS
IONS
NITROGEN
PRECIPITATION
PROTEINS
SOLUTIONS
TEMPERATURE
URANYL COMPOUNDS