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Laboratory observation of the valence anion of cyanoacetylene, a possible precursor for negative ions in space

J. Chem. Phys. 131, 161102 (2009); doi:10.1063/1.3257174

Published 23 October 2009

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Daniel J. Goebbert, Dmitry Khuseynov, and Andrei Sanov
Department of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721-0041, USA
Valence anions of cyanoacetylene, HCCCN−, are synthesized by the 1,2-H2+ abstraction reaction of O− with acrylonitrile, H2C=CHCN, while the competing 1,1-H2+ channel of the same reaction yields the cyanovinylidene anions, CCHCN−. The key to the formation of the elusive, adiabatically weakly bound HCCCN− is the bent −C-dot =C-dot–C[equivalent]skeleton of the reactant. The photoelectron spectrum of HCCCN−, measured by means of photoelectron imaging at 532 nm, consists of a broad structureless band with a vertical detachment energy of 1.04±0.05  eV. The observed anions are stable counterparts of the low-lying anionic resonances of cyanoacetylene, which may contribute (by way of dissociative attachment) to the formation of carbon-rich and CN-containing negative ions in extraterrestrial environments. ©2009 American Institute of Physics
History: Received 22 September 2009; accepted 9 October 2009; published 23 October 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/161102/1
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KEYWORDS and PACS

Keywords
PACS
  • 82.30.Hk
    Chemical exchanges (substitution, atom transfer, abstraction, disproportionation, and group exchange)
  • 95.30.Ft
    Astrophysical molecular and chemical processes and interactions
  • 34.80.Ht
    Dissociation and dissociative attachment by electron/positron impact (atoms and molecules)
  • 33.60.+q
    Photoelectron spectra of molecules
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
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