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Infrared photodissociation spectroscopy of cold cationic trimethylamine complexes

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Abstract

Cryogenic ion-trap infrared photodissociation spectroscopy combined with a dielectric barrier discharge source was constructed to establish the general trends in the stepwise growth motif of trimethylamine (TMA)n+ complexes. The results showed a strong preference for the formation of a stable charge-shared N⋯N type (TMA)2+ ion core over the proton-transferred C⋯HN type ion core, evidencing that the source condition has a remarkable effect on the kinetic stability of isomers. A maximum of four TMA molecules are located perpendicularly to the N⋯N axis of the charge-shared (TMA)2+ ion core. In the n = 7 and 8 clusters, the subsequent two TMA molecules are located at each end of the N⋯N axis of the (TMA)2+ ion core, completing the first coordination shell. Starting at n = 9, the additional TMA molecules form a second solvation shell, and the cluster spectra show similarities to the solution phase spectrum of aqueous TMA.

Graphical abstract: Infrared photodissociation spectroscopy of cold cationic trimethylamine complexes

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Publication details

The article was received on 11 Jun 2018, accepted on 04 Jul 2018 and first published on 04 Jul 2018


Article type: Paper
DOI: 10.1039/C8CP03672A
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Infrared photodissociation spectroscopy of cold cationic trimethylamine complexes

    X. Lei, X. Kong, Z. Zhao, B. Zhang, D. Dai, X. Yang and L. Jiang, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP03672A

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