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In chemistry, dissociative substitution describes a reaction pathway by which compounds interchange ligands. The term is typically applied to coordination and organometallic complexes, but resembles the SN1 mechanism in organic chemistry. This pathway can be well described by the cis effect, or the labilization of CO ligands in the cis position. The opposite pathway is associative substitution, being analogous to SN2 pathway. Pathways that are intermediate between the pure dissociative and pure associative pathways are called interchange mechanisms.

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  • Sustitución disociativa (es)
  • Dissociative substitution (en)
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  • In chemistry, dissociative substitution describes a reaction pathway by which compounds interchange ligands. The term is typically applied to coordination and organometallic complexes, but resembles the SN1 mechanism in organic chemistry. This pathway can be well described by the cis effect, or the labilization of CO ligands in the cis position. The opposite pathway is associative substitution, being analogous to SN2 pathway. Pathways that are intermediate between the pure dissociative and pure associative pathways are called interchange mechanisms. (en)
  • La sustitución disociativa describe una trayectoria de reacción por la que los compuestos intercambian ligandos. El término es aplicado comúnmente a complejos de coordinación y organometálicos, pero se asemeja al mecanismo SN1 en química orgánica. La trayectoria opuesta es la sustitución asociativa, que es análoga a la trayectoria SN2. Existen trayectorias intermedias entre los mecanismos disociativo puro y asociativo puro, estos son llamados .​​ (es)
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  • In chemistry, dissociative substitution describes a reaction pathway by which compounds interchange ligands. The term is typically applied to coordination and organometallic complexes, but resembles the SN1 mechanism in organic chemistry. This pathway can be well described by the cis effect, or the labilization of CO ligands in the cis position. The opposite pathway is associative substitution, being analogous to SN2 pathway. Pathways that are intermediate between the pure dissociative and pure associative pathways are called interchange mechanisms. Complexes that undergo dissociative substitution are often coordinatively saturated and often have octahedral molecular geometry. The entropy of activation is characteristically positive for these reactions, which indicates that the disorder of the reacting system increases in the rate-determining step. (en)
  • La sustitución disociativa describe una trayectoria de reacción por la que los compuestos intercambian ligandos. El término es aplicado comúnmente a complejos de coordinación y organometálicos, pero se asemeja al mecanismo SN1 en química orgánica. La trayectoria opuesta es la sustitución asociativa, que es análoga a la trayectoria SN2. Existen trayectorias intermedias entre los mecanismos disociativo puro y asociativo puro, estos son llamados .​​ Las trayectorias disociativas están caracterizadas por una que involucra la liberación de un ligando desde la esfera de coordinación del metal que sufre la sustitución. La concentración del nucleófilo sustituyente no ejerce influencia en esta velocidad. Puede detectarse un intermediario de número de coordinación reducido. Los complejos que sufren sustitución disociativa frecuentemente son coordinativamente insaturados y frecuentemente muestran geometría molecular octaédrica. La [[entropía de activación es característicamente positiva para estas reacción, lo que indica que el desorden en el sistema reaccionante se incrementa en la etapa limitante de la reacción. (es)
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