Observation of conformation-specific pathways in the photodissociation of 1-iodopropane ions

Sang Tae Park, Sang Kyu Kim and Myung Soo Kim ()
Additional contact information
Sang Tae Park: National Creative Research Initiative for Control of Reaction Dynamics and School of Chemistry, Seoul National University
Sang Kyu Kim: Inha University
Myung Soo Kim: National Creative Research Initiative for Control of Reaction Dynamics and School of Chemistry, Seoul National University

Nature, 2002, vol. 415, issue 6869, 306-308

Abstract: Abstract Many molecules can rotate freely around single bonds and thereby interconvert between different conformations, such as gauche and anti 1,2-disubstituted ethane, a classic example of conformational isomerism1,2,3. Even though rotation occurs rapidly at room temperature, the product selectivity seen in some reactions has been explained by conformation-dependent reaction mechanisms4,5: if reactant molecules differing only in their conformation are located at different positions on the reaction path, they may undergo different reactions. But a direct verification of this effect is difficult, because the energy barrier separating conformational isomers is so low that under ambient conditions reactants with more than one conformation will be present1. But by using temperatures low enough to suppress the interconversion between different conformations, gauche-1-iodopropane ions and anti-1-iodopropane ions have been selectively generated6. Here we show that the kinetic energy released during the photodissociation of 1-iodopropane ions depends strongly on the conformation of the ions. Thermodynamic arguments and ab initio calculations indicate that this difference in kinetic energy release results from differences in the reaction mechanism, with gauche-1-iodopropane ions forming 2-propyl ions and anti-1-iodopropane ions forming protonated cyclopropane ions. These findings suggest that the well-known concept of conformation selection forms the basis of a simple scheme for reaction control, thus providing in some cases an attractive alternative for more involved schemes that utilize the phase and pulse shape of laser beams to control chemical reactions7,8,9,10.

Date: 2002
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/415306a Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:nature:v:415:y:2002:i:6869:d:10.1038_415306a

Ordering information: This journal article can be ordered from
https://www.nature.com/

DOI: 10.1038/415306a

Access Statistics for this article

Nature is currently edited by Magdalena Skipper

More articles in Nature from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().