Influence of diluent on alkylmalonamide radiolysis

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Abstract

The radiolysis of the extractant N1,N3-dimethyl-N1,N3-dibutyltetradecylmalonamide and its 30% solution in n-tridecane under the action of 3 MeV electrons was studied. The key radiolytic processes are fragmentation of the extractant molecules. The decomposition is predominant along the bonds located in the β-position relative to the carbonyl group: N-Me, N-Bu, C-C14H29 and C-C(O). The C-C(O) bond is the weakest – its cleavage gives more than half of all the extractant degradation products. The observed yield of extractant degradation in solution is almost one and a half times higher than in the undiluted state. At the same time, a decrease in the yield of diluent degradation is observed in the solution. The observed effects indicate partial physical and chemical protection of the diluent by the dissolved extractant.

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About the authors

T. V. Khalikov

Frumkin Institute of Physical Chemistry and Electrochemistry RAS

Email: ponomarev@ipc.rssi.ru
Russian Federation, Moscow

E. M. Kholodkova

Frumkin Institute of Physical Chemistry and Electrochemistry RAS

Email: ponomarev@ipc.rssi.ru
Russian Federation, Moscow

A. V. Ponomarev

Frumkin Institute of Physical Chemistry and Electrochemistry RAS

Author for correspondence.
Email: ponomarev@ipc.rssi.ru
Russian Federation, Moscow

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Supplementary files

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1. JATS XML
2. Fig. 1. Comparison of sections of the chromatograms of the extractant (a) and solution (б) at an absorbed dose of 50 kGy. The peaks of N-butyl-N-methylhexadecanamide (I), N1-butyl-N1,N3-dimethyl-2-tetradecylmalonamide (II) and N1,N3-dibutyl-N1-methyl-2-tetradecylmalonamide (III) are marked.

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3. Fig. 2. Comparison of sections of the chromatograms of the diluent (a) and solution (б) at an absorbed dose of 150 kGy. The peaks of hydrocarbons C5-C10, as well as peaks of N-methyl-butanamine (I), N-butylformamide (II), and N-methyl-N-butylformamide (III) are noted.

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4. Fig. 3. Comparison of sections of the chromatograms of the diluent (a) and solution (б) at an absorbed dose of 150 kGy. The peaks of hydrocarbons C22-C26 and the peak of N-methyl-N-butylhexadecanamide (I) are marked.

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5. Fig. 4. Comparison of sections of the chromatograms of the solution at an absorbed dose of 50 kGy (a) and 150 kGy (б). The areas of the peaks caused by the addition of alkyl groups C1-C10 to the molecule of the initial extractant are marked.

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6. Rice. 5. Scheme of the decomposition of the H-adduct.

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7. Formula 5

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8. Formula 6

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9. Formula 7

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