Low-Temperature Reactivity of C2n+1N- Anions with Polar Molecules

Abstract : Following the recent discovery of molecular anions in the interstellar medium, we report on the kinetics of proton transfer reactions between cyanopolyynide anions C2n+1N- (n = 0, 1, 2) and formic acid HCOOH. The results, obtained from room temperature down to 36 K by means of uniform supersonic flows, show a surprisingly weak temperature dependence of the CN- reaction rate, in contrast with longer chain anions. The CN- + HCOOH reaction is further studied theoretically via a reduced dimensional quantum model that highlights a tendency of the reaction probability to decrease with temperature, in agreement with experimental data but at the opposite of conventional long-range capture theories. In return, comparing HCOOH to HC3N as target molecules suggests that dipole-dipole interactions must play an active role in overcoming this limiting effect at low temperatures. This work provides new fundamental insights on prototypical reactions between polar anions and polar molecules along with critical data for astrochemical modeling. © 2016 American Chemical Society.
Type de document :
Article dans une revue
Journal of Physical Chemistry Letters, American Chemical Society, 2016, 7, pp.2957--2961. 〈10.1021/acs.jpclett.6b01191〉
Domaine :
Liste complète des métadonnées

https://hal-univ-rennes1.archives-ouvertes.fr/hal-01367245
Contributeur : Laurent Jonchère <>
Soumis le : jeudi 15 septembre 2016 - 17:18:07
Dernière modification le : samedi 22 décembre 2018 - 19:32:25

Identifiants

Citation

Baptiste Joalland, Nour Jamal-Eddine, J. Kłos, F. Lique, Y. Trolez, et al.. Low-Temperature Reactivity of C2n+1N- Anions with Polar Molecules. Journal of Physical Chemistry Letters, American Chemical Society, 2016, 7, pp.2957--2961. 〈10.1021/acs.jpclett.6b01191〉. 〈hal-01367245〉

Partager

Métriques

Consultations de la notice

245