DOI: 10.1073/pnas.96.2.338. Ultrafast electron diffraction and direct observation of transient structures in a chemical reaction

Ultrafast electron diffraction and direct observation of transient structures in a chemical reaction

10.1073/pnas.96.2.338

Crossref journal-article

Proceedings of the National Academy of Sciences

Proceedings of the National Academy of Sciences (341)

Abstract

Ultrafast electron diffraction is a unique method for the studies of structural changes of complex molecular systems. In this contribution, we report direct ultrafast electron diffraction study of the evolution of short-lived intermediates in the course of a chemical change. Specifically, we observe the transient intermediate in the elimination reaction of 1,2-diiodotetrafluoroethane (C 2 F 4 I 2 ) to produce the corresponding ethylene derivative by the breakage of two carbon–iodine, C—I, bonds. The evolution of the ground-state intermediate (C 2 F 4 I radical) is directly revealed in the population change of a single chemical bond, namely the second C—I bond. The elimination of two iodine atoms was shown to be nonconcerted, with reaction time of the second C—I bond breakage being 17 ± 2 ps. The structure of the short-lived C 2 F 4 I radical is more favorable to the classical radical structure than to the bridged radical structure. This leap in our ability to record structural changes on the ps and shorter time scales bodes well for many future applications in complex molecular systems.

Bibliography

Cao, J., Ihee, H., & Zewail, A. H. (1999). Ultrafast electron diffraction and direct observation of transient structures in a chemical reaction. Proceedings of the National Academy of Sciences, 96(2), 338â342.

Authors 3

Jianming Cao (first)
Hyotcherl Ihee (additional)
Ahmed H. Zewail (additional)

References 29 Referenced 70

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, eds J Manz, L Wöste (VCH, New York Femtosecond Chemistry, 1995). / Femtosecond Chemistry by Manz J (1995)
A H Zewail Femtochemistry: Ultrafast Dynamics of the Chemical Bond (World Scientific, Singapore, 1994). / Femtochemistry: Ultrafast Dynamics of the Chemical Bond by Zewail A H (1994)
Castleman A. W. Jr. ed. (1998) J. Phys. Chem. A 102 4021–4404. (10.1021/jp9728666)
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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 10:32 a.m.)
Deposited	3 years, 4 months ago (April 13, 2022, 4:48 p.m.)
Indexed	5 months ago (March 26, 2025, 1:35 p.m.)
Issued	26 years, 7 months ago (Jan. 19, 1999)
Published	26 years, 7 months ago (Jan. 19, 1999)
Published Online	26 years, 7 months ago (Jan. 19, 1999)
Published Print	26 years, 7 months ago (Jan. 19, 1999)

Funders 0

None

BibTeX

@article{Cao_1999, title={Ultrafast electron diffraction and direct observation of transient structures in a chemical reaction}, volume={96}, ISSN={1091-6490}, url={http://dx.doi.org/10.1073/pnas.96.2.338}, DOI={10.1073/pnas.96.2.338}, number={2}, journal={Proceedings of the National Academy of Sciences}, publisher={Proceedings of the National Academy of Sciences}, author={Cao, Jianming and Ihee, Hyotcherl and Zewail, Ahmed H.}, year={1999}, month=jan, pages={338–342} }

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