Reaction of uranium (IV) with xenon difluoride by chemiluminescence, spectrophotometric, and spectrofluorimetric methods

Journal Article · Fri Jul 01 00:00:00 EDT 1988 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:6047036

Mamykin, A V; Kazakov, V P

A study is made of the kinetics of the chemiluminescent reaction of oxidation of uranium (IV) by xenon difluoride in 1M HClO/sub 4/ U/sup 4 +/ + XeF/sub 2/ ..-->.. UO/sub 2//sup 2 +/ = h/eta/. The optical density D and the intensity of the photoluminescence of the solution I/sub PL/ were measured in parallel with recording of the luminescence intensity I/sub CL/. I/sub CL/ attains a maximum value some time after the beginning of the reaction, after which it decays exponentially. On the kinetic curves of the time dependence of D and I/sub PL/ an induction period is observed, the extent of which depends on concentrations of reagents and temperature of the solution. The maximum of I/sub CL/ coincides with the end of the induction period if the measurements are carried out under identical conditions. The rate of the reaction after the induction period is described by a first order equation in U/sup (IV)/. The rate constants of the reaction, obtained by chemiluminescence, spectrophotometric, and spectrofluorimetric methods, have close values 2.0 +- 0.4, 1.8 +- 0.3, and 2.1 +- 0.3 sec/sup /minus/1/ x 10/sup 2/, respectively. On the basis of the results obtained, we conclude that the stages of formation of UO/sub 2//sup 2 +/ and of chemiluminescence coincide, i.e., formation of the excited state (UD/sub 2//sup 2 +/) and of chemiluminescence coincide, i.e., formation of the excited state (UD/sub 2//sup 2 +/)* takes place during the reaction. It is proposed and experimentally verified that the reaction passes through an intermediate stage of formation of uranyl ion UO/sub 2//sup +/.

• OSTI ID: 6047036
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Vol. 29:6; Other Information: Translated from Radiokhimiya; 29: No. 6, (Nov-Dec 1987)
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
URANIUM COMPOUNDS
OXIDATION
XENON FLUORIDES
REDOX POTENTIAL
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMILUMINESCENCE
FLUORESCENCE SPECTROSCOPY
KINETIC EQUATIONS
OPACITY
PHOTOLUMINESCENCE
SPECTROPHOTOMETRY
TIME DEPENDENCE
URANYL COMPOUNDS
VALENCE
ACTINIDE COMPOUNDS
CHEMICAL REACTIONS
EMISSION SPECTROSCOPY
EQUATIONS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
KINETICS
LUMINESCENCE
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RARE GAS COMPOUNDS
REACTION KINETICS
SPECTROSCOPY
XENON COMPOUNDS
YIELDS
400201* - Chemical & Physicochemical Properties