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Accessible Unlicensed Requires Authentication Published by Oldenbourg Wissenschaftsverlag May 6, 2014

Infrared Photodissociation Spectroscopy of C2n+1N Anions with n = 1 – 5

E. Cristina Stanca-Kaposta, Falko Schwaneberg, Matias R. Fagiani, Torsten Wende, Franz Hagemann, Annett Wünschmann, Ludger Wöste and Knut R. Asmis

Abstract

The gas phase vibrational spectroscopy of cryogenically cooled C2n + 1N anions with n = 1 − 5 is investigated in the spectral range of the C≡C and C≡N stretching modes (1850–2400 cm1) by way of infrared photodissociation (IRPD) spectroscopy of messenger-tagged C2n+1N· mD2 complexes. The IRPD spectra are assigned based on a comparison to previously reported anharmonic and harmonic CCSD(T) vibrational frequencies and intensities. Experimentally determined and predicted anharmonic vibrational transition energies lie within ± 21 cm1. For the harmonic CCSD(T)/vqz+ vibrational frequencies a scaling factor of 0.9808 is determined, resulting in comparable absolute deviations. The influence of the D2-messenger molecules on the structure and the IRPD spectrum is found to be small. Compared to the results of previous IR matrix isolation studies additional, in particular weaker, IR-active transitions are identified.

Received: 2014-1-17
Accepted: 2014-4-8
Published Online: 2014-5-6
Published in Print: 2014-5-28

©2014 Walter de Gruyter Berlin/Boston