Kinetics of the gas-phase reaction between iodine and trimethylsilane and the bond dissociation energy D(Me3Si—H). Part 2
- 1 January 1979
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 75, 1126-1131
- https://doi.org/10.1039/f19797501126
Abstract
The title reaction has been investigated in the temperature range 565–599 K with a view to improving the precision of previous data. The reaction obeyed the rate law –d[I2]//dt =k[I2]½[Me3SiH]//1 +k′[HI]/[I2] over a range of iodine and trimethylsilane pressures provided the ratio [Me3SiH]0/[I2]0 was greater than ≈ 25. At lower values of this ratio, although the data appeared to fit the integrated rate equation, the value of k tended to be high. It is argued that k values at the limiting high reactant ratio represent the true homogeneous reaction. The data are used to obtain log(k1/dm3 mol–1 s–1)=(11.15 ± 0.11)–(87.4 ± 1.2 kJ mol–1)/RTln 10 for the abstraction reaction I·+ Me3SiH [graphic omitted] Me3Si·+ Hi. It is further deduced that the bond dissociation energy, D(Me3Si—H)= 378 ± 6 kJ mol–1. This value is in agreement with the previous value (Part 1) although it is more precise.Keywords
This publication has 0 references indexed in Scilit: