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Issue 14, 2006
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An experimental and theoretical study of ring closing dynamics in HN3

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Abstract

We report on an H(D)-atom Rydberg tagging experiment for H(D)N3 photolysis providing detailed dynamical information on the wavelength dependence of the H(D) + N3 channel. We observe subtle yet striking changes in the photochemical dynamics as the photolysis energy passes through ∼5.6 eV. In addition to producing linear azide with an average of ∼40% of available energy appearing as translation, a second H(D)-atom producing channel grows in above this energy releasing only about 15%. An observed (inverse) isotope effect suggests that statistical decomposition on S0 is unimportant. High level ab initio quantum chemical calculations reveal a transition state to cyclization of the N3 moiety in H(D)N3 on the first excited singlet (S1) surface that is close in energy to the experimentally observed threshold energy for this “slow channel”. Furthermore, the translational energy release of the “slow channel” is energetically consistent with cyclic-N3 formation. This work provides the clearest presently available insights into how ring closure can occur in azide photochemistry.

Graphical abstract: An experimental and theoretical study of ring closing dynamics in HN3

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Article information


Submitted
16 Jan 2006
Accepted
17 Feb 2006
First published
01 Mar 2006

Phys. Chem. Chem. Phys., 2006,8, 1690-1696
Article type
Paper

An experimental and theoretical study of ring closing dynamics in HN3

J. Zhang, P. Zhang, Y. Chen, K. Yuan, S. A. Harich, X. Wang, Z. Wang, X. Yang, K. Morokuma and A. M. Wodtke, Phys. Chem. Chem. Phys., 2006, 8, 1690
DOI: 10.1039/B600599C

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