Electrochemical and spectroscopic studies of neptunium in the aluminum chloride-1-n-butylpyridinium chloride melt at 40/sup 0/C
The chemistry of neptunium in acidic and basic AlCl/sub 3/-1-n-butylpyridinium chloride melts at 40/sup 0/C has been investigated by means of electrochemical and spectral techniques. In acidic as well as in basic melts, the reduction of Np(IV) to Np(III) at glassy-carbon electrodes is quasi-reversible. Indirect measurements of the formal potential and spectroscopic results on the Np(IV)-Np(III) system as a function of the acidity indicate that Np(III) and Np(IV) exist as NpCl/sub 6//sup 3 -/ and NpCl/sub 6//sup 2 -/ and solvated Np/sup 3 +/ and NpCl/sub x//sup (4-x)+/ (with 3 greater than or equal to x greater than or equal to 1), respectively, in basic and acidic melts. The apparent rate constant K/sup 0/' has been measured on the basic and acidic sites. It depends on the melt acidity only in the latter melts. The Nugent linearization method has been applied to the standard potentials of Np(IV)-Np(III) and U(IV)-U(III) in 2:1 melts. A comparison with the results obtained from other room-temperature solvents shows, as already found with lanthanides, that the acidic melt is a very weak solvating medium.
- Research Organization:
- Univ. of Liege, Belgium
- OSTI ID:
- 5132381
- Journal Information:
- Inorg. Chem.; (United States), Vol. 24:13
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NEPTUNIUM
ELECTROCHEMISTRY
REDOX REACTIONS
ALUMINIUM CHLORIDES
EXPERIMENTAL DATA
MOLTEN SALTS
ORGANIC CHLORINE COMPOUNDS
PYRIDINIUM COMPOUNDS
SPECTROSCOPY
ACTINIDES
ALUMINIUM COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
AZINES
CHEMICAL REACTIONS
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
DATA
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HETEROCYCLIC COMPOUNDS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
QUATERNARY COMPOUNDS
SALTS
TRANSURANIUM ELEMENTS
400700* - Radiochemistry & Nuclear Chemistry