TERMIUM Plus®

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NULL ISOTOPE EFFECT [2 records]

Record 1 1997-09-26

English

Subject field(s)
  • Chemistry
DEF

The absence of isotopic discrimination for rate or equilibrium constants (klight/kheavy = 1 or Klight/Kheavy = 1) ...

OBS

It is more commonly thought of as a null isotope effect, on the grounds that there is zero isotopic effect on the corresponding standard Gibbs energy change. i. e. that an isotope effect exists only when the ratio of rate or equilibrium constants differs from unity.

French

Domaine(s)
  • Chimie
DEF

[...] absence d'effet d'un isotope sur les constantes de vitesse ou d'équilibre (k [indice] léger/k [indice] lourd= 1 ou K [indice] léger/K [indice] lourd = 1) [...]

OBS

[...] on parle plus communément d'«effet isotopique nul», puisqu'il n'y a pas d'effet isotopique sur la différence des énergies de Gibbs standard. En d'autres termes, on considère qu'il y a un effet isotopique que lorsque le rapport des constantes de vitesse ou d'équilibre est différent de l'unité.

Spanish

Save record 1

Record 2 1997-07-09

English

Subject field(s)
  • Chemical Engineering
DEF

The ratio of the rate constants of two reactions that differ only in the identity of the element of the atom in the leaving group by which the leaving roup is attached to the rest of the substrate molecule. As for isotope effects, a ratio of unity is thought of as a null effect.

French

Domaine(s)
  • Génie chimique
DEF

Rapport des constantes de vitesse de deux réactions qui ne diffèrent que par l'identité de l'atome du groupe partant par lequel ce groupe est lié au reste de la molécule que l'on considère comme substrat. Comme dans le cas des effets isotopiques, on considère que l'effet est nul quand ce rapport est égal à un.

Spanish

Save record 2

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