期刊
JOURNAL OF CHEMICAL PHYSICS
卷 137, 期 22, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4769878
关键词
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资金
- Ministry of Education, Sports, Science and Technology in Japan (MEXT) [23685005, 477, 19056005]
- JSPS
- Grants-in-Aid for Scientific Research [19056005, 23685005] Funding Source: KAKEN
Rearrangement of intermolecular hydrogen bond in a monohydrated tryptamine cation, [TRA(H2O)(1)](+), has been investigated in the gas phase by IR spectroscopy and quantum chemical calculations. In the S-0 state of TRA(H2O)(1), a water molecule is hydrogen-bonded to the N atom of the amino group of a flexible ethylamine side chain [T. S. Zwier, J. Phys. Chem. A 105, 8827 (2001)]. A remarkable change in the hydrogenbonding motif of [TRA(H2O)](+) occurs upon photoionization. In the D-0 state of [TRA(H2O)(1)](+), the water molecule is hydrogen-bonded to the NH group of the indole ring of TRA(+), indicating that the water molecule transfers from the amino group to NH group. Quantum chemical calculations are performed to investigate the pathway of the water transfer. Two potential energy barriers emerge in [TRA(H2O)(1)](+) along the intrinsic reaction coordinate of the water transfer. The water transfer event observed in [TRA(H2O)(1)](+) is not an elementary but a complex process. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769878]
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