LeHavreV1, Main, Exploration, bibRecord, 000050

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

Identifieur interne : 000050 ( Main/Exploration ); précédent : 000049; suivant : 000051

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

Auteurs : Baptiste Joalland [France] ; Nour Jamal-Eddine [France] ; Jacek Kłos [États-Unis] ; François Lique [France] ; Yann Trolez [France] ; Jean-Claude Guillemin [France] ; Sophie Carles [France] ; Ludovic Biennier [France]

Source :

The journal of physical chemistry letters [ 1948-7185 ] ; 2016.

RBID : pubmed:27399038

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.

DOI: 10.1021/acs.jpclett.6b01191
PubMed: 27399038

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">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.</div>
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Low-Temperature Reactivity of C2n+1N(-) Anions with Polar Molecules.

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

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Abstract

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