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Rate constants and kinetic isotope effects in hydrogen abstractions by H from formic acid

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image of Research on Chemical Intermediates

Competitive kinetic experiments were performed for the reactions of H atoms with HCOOH and DCOOD in aqueous solution. Excellent Arrhenius behavior is represented by log(k/M-1 s-1) = (11.6 ± 0.2) - (34.0 ± 1.1) kJ mol-1/2.303RT ) for HCOOH, log(k/M-1 s-1) = (11.8 ± 0.2) - (39.8 ± 1.2) kJ mol-1/2.303RT ) for DCOOD. Kinetic isotope effects are discussed in terms of transition state theory, supported by ab initio calculations, and in comparison with previous results for the abstraction from the formate ion.

Affiliations: 1: Institute of Physical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany; 2: Chemistry Division, Argonne National Laboratory, Argonne, Illinois, 60439, USA


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