Gas‐Phase Infrared Spectra of Three Compounds of Astrochemical Interest: Vinyl,Allenyl, and Propargyl Isocyanides |
| |
Authors: | Dr Abdessamad Benidar Prof Dr Didier Bégué Dr Falk Richter Prof Dr Claude Pouchan Prof Dr Mohammed Lahcini Dr Jean‐Claude Guillemin |
| |
Institution: | 1. Institut de Physique de Rennes, CNRS UMR 6251, Université de Rennes1, 35042 Rennes (France);2. Université de Pau et des Pays de l'Adour, CNRS UMR 5254, Institut Pluridisciplinaire sur l'Environnement et les Matériaux (IPREM), Equipe de Chimie Physique (ECP), Technopole Hélioparc, 2, avenue du Président Angot, 64053 Pau cedex 9 (France);3. Laboratoire de Chimie Organométallique et Macromoléculaire—Matériaux Composites Faculté des Sciences et Techniques Marrakech, Université Cadi Ayyad BP 549, Marrakech (Morocco);4. école Nationale Supérieure de Chimie de Rennes, CNRS UMR 6226 CNRS‐ENSCR, Avenue du Général Leclerc, CS 50837, 35708 Rennes Cedex 7 (France) |
| |
Abstract: | Isocyanides, isomers of the cyanides detected in the interstellar medium, are also possible components of this medium. The infrared spectra (5000–500 cm?1) of gaseous vinyl isocyanide, allenyl isocyanide, and propargyl isocyanide have been recorded at 0.1 cm?1 resolution. When prepared on a gram scale to produce a partial pressure of 10 mbar after evaporation in the cell, these three isocyanides, which have previously been reported to be kinetically unstable, do not display any sign of decomposition when recording the spectra. Geometry optimizations and harmonic and anharmonic vibrational frequencies were calculated using the LCCSD(T) method with the cc‐pVTZ basis set. Anharmonic frequencies of fundamental, overtone, and combination transitions were calculated using a variational approach implemented in the P Anhar.v2.0 code, to assign the experimental data for each compound. These results improve our knowledge of these under‐investigated compounds and pave the way for other physicochemical studies on functionalized isocyanides. |
| |
Keywords: | computational chemistry density functional calculations interstellar compounds IR spectroscopy isocyanides |
|
|