Preferred Label : Gibbs energy of activation;
Detailed label : Gibbs energy of activation (standard free energy of activation), Δ‡Go;
IUPAC definition : The standard Gibbs energy difference between the transition state of a reaction (either
an elementary reaction or a stepwise reaction) and the ground state of the reactants.
It is calculated from the experimental rate constant k i via /i the conventional
form of the absolute rate equation: \[Δ {\ddagger}G R\ T\ \left[\ln (\frac{k_{{B}}}{h})
- \ln (\frac{k}{T})\right]\] where kB is the Boltzmann constant and h the Planck constant
(kB/h 2.08358 x 10E10 K-1 s ). The values of the rate constants, and hence Gibbs
energies of activation, depend upon the choice of concentration units (or of the thermodynamic
standard state).;
Origin ID : G02631;
See also
The standard Gibbs energy difference between the transition state of a reaction (either
an elementary reaction or a stepwise reaction) and the ground state of the reactants.
It is calculated from the experimental rate constant k i via /i the conventional
form of the absolute rate equation: \[Δ {\ddagger}G R\ T\ \left[\ln (\frac{k_{{B}}}{h})
- \ln (\frac{k}{T})\right]\] where kB is the Boltzmann constant and h the Planck constant
(kB/h 2.08358 x 10E10 K-1 s ). The values of the rate constants, and hence Gibbs
energies of activation, depend upon the choice of concentration units (or of the thermodynamic
standard state).
