Isotope Effects in the Reactions of <SUP>80</SUP>Br Activated by Isomeric Transition with Various Deuterated Propanes

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概要

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• Product studies of the reactions of recoil <SUP>80</SUP>Br with propanes in binary mixtures with ethane showed that the difference in the energy-loss efficiency of C<SUB>3</SUB>H<SUB>8</SUB> and C<SUB>3</SUB>D<SUB>8</SUB> in collision with <SUP>80</SUP>Br was less than 10%. Then, the yields for the substitution of <SUP>80</SUP>Br for atoms or groups have been compared in various deuterated propanes. A reactivity integral-isotope effect has been observed in the yields of products from CD<SUB>3</SUB>CD<SUB>2</SUB>CD<SUB>3</SUB> and CD<SUB>3</SUB>CH<SUB>2</SUB>CD<SUB>3</SUB>, except in the case of isopropyl bromide from the latter compound. However, it has been observed only in the yield of iso propyl bromide from CH<SUB>3</SUB>CD<SUB>2</SUB>CH<SUB>3</SUB>. These results indicate that the chemical and physical properties of both replaced and residual atoms or groups play a role in the observed isotope effects. With a "complex" formation mechanism, it is suggested that an isotope effect appears mostly when the kinetic energy of the reacting <SUP>80</SUP>Br is at the lower-energy end of the reaction-energy range.

• 公益社団法人 日本化学会の論文

著者

• Numakura Kenshi

  Division of Chemistry, Japan Atomic Energy Research Institute

関連論文

• An Additional Formation of CH280BrBr via a Kinetic-energy-independent Process in the Highly Moderated 80mBr-CH4 Systems
• Isotope Effects in the Reactions of 80Br Activated by Isomeric Transition with Various Deuterated Propanes

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