Preferred Label : linear free-energy relation;
IUPAC definition : A linear correlation between the logarithm of a rate constant or equilibrium constant
for one series of reactions and the logarithm of the rate constant or equilibrium
constant for a related series of reactions. Typical examples of such relations (also
known as linear Gibbs energy relations) are the Brønsted relation, and the Hammett
equation. br/ The name arises because the logarithm of an equilibrium constant (at
constant temperature and pressure) is proportional to a standard free energy (Gibbs
energy) change, and the logarithm of a rate constant is a linear function of the free
energy (Gibbs energy) of activation. br/ It has been suggested that this name should
be replaced by linear Gibbs energy relation, but at present there is little sign of
acceptance of this change. The area of physical organic chemistry which deals with
such relations is commonly referred to as 'Linear Free-Energy Relationships'.;
Origin ID : L03551;
See also
A linear correlation between the logarithm of a rate constant or equilibrium constant
for one series of reactions and the logarithm of the rate constant or equilibrium
constant for a related series of reactions. Typical examples of such relations (also
known as linear Gibbs energy relations) are the Brønsted relation, and the Hammett
equation. br/ The name arises because the logarithm of an equilibrium constant (at
constant temperature and pressure) is proportional to a standard free energy (Gibbs
energy) change, and the logarithm of a rate constant is a linear function of the free
energy (Gibbs energy) of activation. br/ It has been suggested that this name should
be replaced by linear Gibbs energy relation, but at present there is little sign of
acceptance of this change. The area of physical organic chemistry which deals with
such relations is commonly referred to as 'Linear Free-Energy Relationships'.