Complex formation between neptunium(V) and various thiosemicarbazide derivatives in aqueous solution
Complex formation between neptunium(V) and various thiosemicarbazide derivatives in solution has been studied spectrophotometrically in the pH range 4-10. Stepwise formation of three types of complexes, with composition NpO/sub 2/HA, NpO/sub 2/A/sup -/, and NpOHA/sup 2 -/, has been demonstrated with salicylaldehyde thiosemicarbazone (H/sub 2/L) and salicylaldehyde S-methyl-isothiosemicarbazone (H/sub 2/Q) at t = 25 +/- 1/sup 0/C and ..mu.. = 0.05. The logarithmic stability constants of the first two complexes are 5.14 +/- 0.06, 11.85 +/- 0.04 and 8.42 +/- 0.09, 13.33 +/- 0.015 for H/sub 2/L and H/sub 2/Q, respectively; equilibrium constants for the formation of hydroxo complexes of the form NpO/sub 2/OHL/sup 2 -/ and NpO/sub 2/OHQ/sup 2 -/ were also determined, and found to be equal to (2.23 +/-0.37) x 10/sup -5/ and (5.02 +/- 0.9) x 10/sup -5/, respectively. In the case of S-methyl-N/sub 1/,N/sub 4/-bis(salicylidene)isothiosemicarbazide (H/sub 2/Z), only one type of complex is formed under these experimental conditions, namely, NpO/sub 2/Z/sup -/, with a logarithmic stability constant of 4.78 +/- 0.03. Dissociation constants for H/sub 2/Q and H/sub 2/Z were also determined.
- OSTI ID:
- 7030789
- Journal Information:
- Sov. Radiochem. (Engl. Transl.); (United States), Vol. 29:3; Other Information: Translated from Radiokhimiya; 29: No. 3, 286-293(May-Jun 1987)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
NEPTUNIUM COMPLEXES
ABSORPTION SPECTRA
SPECTROPHOTOMETRY
NEPTUNIUM COMPOUNDS
COMPLEXOMETRY
SEMICARBAZIDES
SEMICARBAZONES
ALDEHYDES
DISSOCIATION
EQUILIBRIUM
HYDROXY COMPOUNDS
LIGANDS
ORGANIC SULFUR COMPOUNDS
PH VALUE
SALICYLIC ACID
SYNTHESIS
ACTINIDE COMPLEXES
ACTINIDE COMPOUNDS
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
COMPLEXES
HYDROXY ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
SPECTRA
TRANSURANIUM COMPLEXES
TRANSURANIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties
400102 - Chemical & Spectral Procedures