Chemical speciation of the uranyl ion under alkaline conditions. Synthesis, structures, and oxo ligand exchange dynamics
- Los Alamos National Lab., NM (United States)
The aqueous chemistry of the uranyl(VI) ion (UO{sub 2}{sup 2+}) under acidic conditions is relatively well-known, and uranyl chemistry in near-neutral solutions has received considerable attention due to its importance in radioactive waste isolation and disposal. In contrast, aqueous solution chemistry of the uranyl ion under strongly alkaline conditions, such as those found in aging waste tanks within the DOE complex, is only poorly understood. The tetramethylammonium counterion was used to suppress formation of insoluble uranate salts, M{sub 2}U{sub 2}O{sub 7}, and allow for a detailed structural and spectroscopic characterization of UO{sub 2}(OH){sub n}{sup 2{minus}n} (n = 4, 5) under highly alkaline aqueous solution conditions. Single crystals of [Co(NH{sub 3}){sub 6}]{sub 2}[UO{sub 2}(OH){sub 4}]{sub 3}{center_dot}H{sub 2}O were obtained by cooling a dilute solution of Co(NH{sub 3}){sub 6}Cl{sub 3} and UO{sub 2}(NO{sub 3}){sub 2}{center_dot}6H{sub 2}O in 3.5 M (Me{sub 4}N)OH to 5 C.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 343686
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 7 Vol. 38; ISSN 0020-1669; ISSN INOCAJ
- Country of Publication:
- United States
- Language:
- English
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