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Sundelin, D., Ascenzi, D., Richardson, V., Alcaraz, C., Polášek, M., Romanzin, C., . . . Geppert, W. (2021). The reactivity of methanimine radical cation (H2CNH•+) and its isomer aminomethylene (HCNH2•+) with C2H4. Chemical Physics Letters, 777, Article ID 138677.
Open this publication in new window or tab >>The reactivity of methanimine radical cation (H2CNH•+) and its isomer aminomethylene (HCNH2•+) with C2H4
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2021 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 777, article id 138677Article in journal (Refereed) Published
Abstract [en]

Experimental and theoretical studies are presented on the reactivity of H2CNH'+ (methanimine) and HCNH2'+ (aminomethylene) with ethene (C2H4). Selective isomer generation is performed via dissociative photoionization of suitable neutral precursors and reactive cross sections and branching ratios are measured as a function of photon and collision energies. Differences between isomers' reactivity are discussed in light of ab-initio calculations on reaction mechanisms. The main products, for both isomers, are H-elimination, most likely occurring from covalently bound adducts (giving c-CH2CH2CHNH+/CH2NHCHCH2+) and H' atom transfer to yield H2CNH2+. The astrochemical implications of the results are briefly addressed.

Keywords
Interstellar medium, Rate constant, Astrochemistry molecular astrophysics, Isomerism, Protonated ketenimine, Ion-molecule reactions, Titan's atmosphere
National Category
Chemical Sciences Physical Sciences
Identifiers
urn:nbn:se:su:diva-195958 (URN)10.1016/j.cplett.2021.138677 (DOI)000662693000004 ()2-s2.0-85106251513 (Scopus ID)
Available from: 2021-08-30 Created: 2021-08-30 Last updated: 2022-11-11Bibliographically approved
Richardson, V., Alcaraz, C., Geppert, W., Polášek, M., Romanzin, C., Sundelin, D., . . . Ascenzi, D. (2021). The reactivity of methanimine radical cation (H2CNH.+) and its isomer aminomethylene (HCNH2.+) with methane. Chemical Physics Letters, 775, Article ID 138611.
Open this publication in new window or tab >>The reactivity of methanimine radical cation (H2CNH.+) and its isomer aminomethylene (HCNH2.+) with methane
Show others...
2021 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 775, article id 138611Article in journal (Refereed) Published
Abstract [en]

Experimental and theoretical studies are presented on the reactions of the isomeric radical cations H2CNH+ and HCNH2+ with CH4. Ionic isomers were generated selectively by VUV dissociative photoionization of azetidine and cyclopropylamine precursors respectively. Both exclusively give H2CNH2+ plus CH3 as products, but differences are observed related to a competition between stripping and complex-mediated H-transfer. Astrochemical implications for Titan’s atmosphere are briefly discussed, where the presence of methanimine (H2CNH), a key prebiotic molecule and a potential precursor for tholins, is proposed on the basis of atmospheric models and the observation of CH2NH2+ ions in Cassini mass spectrometric data.

Keywords
Interstellar medium, Rate constants, Ion-molecule reactions, Astrochemistry, Molecular astrophysics, Titan's atmosphere, Methane activation, Isomer, Methanimine, Aminomethylene
National Category
Physical Sciences
Identifiers
urn:nbn:se:su:diva-195709 (URN)10.1016/j.cplett.2021.138611 (DOI)000656477200002 ()2-s2.0-85104947990 (Scopus ID)
Available from: 2021-08-25 Created: 2021-08-25 Last updated: 2022-11-11Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-3753-4738

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