Hostname: page-component-586b7cd67f-2brh9 Total loading time: 0 Render date: 2024-11-25T17:35:04.106Z Has data issue: false hasContentIssue false
  • English
  • Français

Dynamics of the KrF* Laser Multiphoton Dissociation of a Series of Arene Chromium Tricarbonyls

Published online by Cambridge University Press:  25 February 2011

George W. Tyndall  and
Robert L. Jackson
George W. Tyndall
Affiliation:
IBM Almaden Research Center, San Jose, CA 95120
Robert L. Jackson
Affiliation:
IBM Almaden Research Center, San Jose, CA 95120
Get access

Abstract

The KrF* (248 nim) laser multiphoton dissociation (MPD) of a series of (arene)chromium tricarbonyls has been investigated in the gas-phase using emission spectroscopy to detect the excited state photoproducts. In the MPD of all compounds studied, chromium atoms are formed in a variety of electronically excited states via a two-channel dissociation mechanism. The predominant pathway for formation of the ground electronic state and the lowest excited states is by a sequential absorption/fragmentation process, where the product of the one-photon dissociation of the parent molecule absorbs an additional photon and dissociates to Cr(I). The higher energy Cr(I) states are formed exclusively by a direct dissociation process, where the parent absorbs multiple photons prior to dissociation. The distribution of excited chromium atoms formed in the direct channel is statistical for all compounds studied and is independent of the nature of the arene ligand. In contrast, the distribution of Cr(I) states formed via the sequential dissociation channel is strongly dependent on the vibrational density of states in the arene ligand.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 131: Symposium E – Chemical Perspectives of Microelectronic Materials I , 1988 , 481
Copyright
Copyright © Materials Research Society 1989

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Tyndall, G.W. and Jackson, R.L., J. Chem. Phys., 89, 1364, (1988).CrossRefGoogle Scholar
2. Conner, J.A., Martinho-Simoes, J.A., Skinner, H.A., and Zafarani-Moattar, M.T., J. Organometal. Chem., 179, 331, (1979). F.A. Adedeji, D.L.S. Brown, J.A. Connor, M.L. Leung, I.M. Paz-Andrade and H.A. Skinner, J. Organometal. Chem., 97, 221, (1975).CrossRefGoogle Scholar
3. Tyndall, G.W. and Jackson, R.L., J. Am. Chem. Soc., 109, 582, (1987).Google Scholar
4. The products of reaction (2) imply that an intact arene moeity is formed. This has not been established, however. Reference 6 reports that C6H6 + was not observed in the MPI of benzene chromium tricarbonyl.Google Scholar
5. Rooney, D., Chaiken, J., and Driscoll, D. Inorg. Chem., 26, 3939, (1987).Google Scholar
6. Fisanick, G.J., Gedanken, A., Eichelberger, T.S., Keubler, N.A., and Robin, M.B., J. Chem. Phys., 75, 5215, (1981).CrossRefGoogle Scholar
7. Hopkins, J.B., Powers, D.E., and Smalley, R.E., J. Chem. Phys., 73, 683, (1980).Google Scholar