Infrared photodissociation spectroscopy of cold cationic trimethylamine complexes
文献情報
Xiangtao Kong, Zhi Zhao, Dongxu Dai, Xueming Yang, Ling Jiang
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.
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