entropy of activation

entropy of activation

[′en·trə·pē əv‚ak·tə′vā·shən]
(physical chemistry)
The difference in entropy between the activated complex in a chemical reaction and the reactants.
References in periodicals archive ?
The entropy of activation values in the absence and presence of inhibitor are negative.
Enthalpy and entropy of activation decreased, while the Gibbs free energy increased with increased temperatures for the range shown in Table 5.
obs], were used to calculate the activation parameters of the various sugars, including their entropy of activation reported in Tables 3a and b.
In our study comparing the oxidation of xylose and arabinose by V (V) in the presence of Mn (II) chloride as homogeneous catalyst, the entropy of activation was negative; this suggests the reaction proceeds through a hydride transfer process for complex formation.
Whereas the negative values for entropy of activation indicate that the activation complex has a more ordered or more rigid structure than the reactants and the reaction is slower than the normal(17).

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