Preferred Label : inverse isotope effect;
IUPAC definition : A kinetic isotope effect in which kl/kh 1, i.e. the heavier substrate reacts more
rapidly than the lighter one, as opposed to the more usual 'normal' isotope effect,
in which kl/kh 1. The isotope effect will normally be 'normal' when the frequency
differences between the isotopic transition states are smaller than in the reactants.
Conversely, an inverse isotope effect can be taken as evidence for an increase in
the corresponding force constants on passing from the reactant to the transition states.;
Origin ID : I03142;
See also
A kinetic isotope effect in which kl/kh 1, i.e. the heavier substrate reacts more
rapidly than the lighter one, as opposed to the more usual 'normal' isotope effect,
in which kl/kh 1. The isotope effect will normally be 'normal' when the frequency
differences between the isotopic transition states are smaller than in the reactants.
Conversely, an inverse isotope effect can be taken as evidence for an increase in
the corresponding force constants on passing from the reactant to the transition states.
