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Published February 26, 2002 | public
Journal Article

Ultrafast electron diffraction of transient cyclopentadienyl radical: A dynamic pseudorotary structure


Ultrafast electron diffraction (UED) is applied here in the study of the reaction of cylcopentadienyl cobalt dicarbonyl (CpCo(CO)_2) which proceeds to give product structures. These structures were probed by picosecond electron pulses. The major product of the fragmentation was found to be the cyclopentadienyl radical. The dynamic nature of the radical was best represented by a pentagonal molecular structure having D_(5h) symmetry with elevated mean amplitudes of vibration. Comparisons between theory and experiment are presented. The structure is that of the transition state between the compressed (dienylic) and the elongated (allylic) conformations but with longer bond distances, reflecting the dynamics of the pseudorotary surface.

Additional Information

© 2002 Published by Elsevier B.V. Received 12 November 2001. Available online 22 January 2002. We wish to thank the National Science Foundation and the United States Air Force Office of Scientific Research for support of this work. We would also like to thank Dr. Boyd Goodson for his helpful discussion.

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