Kinetic Parameters for Direct Atomic Substitution Reactions |
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Authors: | Denisov E. T. Azatyan V. V. |
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Affiliation: | (1) Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia;(2) Institute of Structural Macrokinetics and Problems of Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia |
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Abstract: | Experimental data (the rate constants and activation energies) for seven reactions of direct substitution of one atom for another D + CH3R CH2DR + H, D + NH3 DNH2 + H, D + H2O HOD + H, F + CH3X CH3F + X (X = F, Cl, Br, and I) involving atoms D and F and molecules C2H6, H2O, NH3, CH3F, CH3Cl, CH3Br, and CH3I are analyzed using the parabolic model of a bimolecular radical reaction. The activation energies for the thermally neutral analogs of these substitution reactions are calculated. Atomic substitution involving deuterium atoms has a lower activation energy of a thermally neutral reaction than radical abstraction or substitution. |
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