Hammond’s postulate – Knowledge and References

Hammond's postulate

Hammond's postulate is a principle in chemistry that states that the transition state of a reaction will resemble either the reactants or the products, depending on which is closer in energy. Additionally, the postulate suggests that the more exothermic a reaction is, the lower the barrier and the faster the reaction kinetics.From: A Q&A Approach to Organic Chemistry [2020], Identification of the most stable silver cluster ions produced under plasma solution conditions [2021]

Elimination Reactions

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Published in Michael B. Smith, A Q&A Approach to Organic Chemistry, 2020

Michael B. Smith

The Hammond postulate states that the transition state of a reaction resembles either the reactants or the products, whichever is closer in energy. What is the general name for the reaction in which H and a halogen are eliminated from an alkyl halide?

Identification of the most stable silver cluster ions produced under plasma solution conditions

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Published in Molecular Physics, 2021

Leighton O. Jones, Chelsea M. Mueller, Peter Bruggeman, George C. Schatz

Although other solvents such as ionic liquids are of interest, we focus on the aqueous environment, modelled here as a continuum. Explicit water molecules that solvate the silver ions have been considered for a few of the clusters we study, but continuum solvation models are known to be highly accurate for thermodynamic properties, and by choosing this level of calculation we are able to study all the possible clusters up to m = 5 and n = 4. We also note that none of the silver cluster ions we consider can oxidise water. Another simplification is that we have not considered rate processes, diffusion control, or barriers for any of the reactions we study. However, some of our conclusions will be guided by the Hammond postulate [14], which says that the more exothermic a reaction, the lower the barrier and the faster the reaction kinetics. We will therefore identify the dominant and most favourable path from the reaction steps that have the most negative reaction energies.

Hammond's postulate

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Elimination Reactions

Identification of the most stable silver cluster ions produced under plasma solution conditions