期刊
CHEMICAL PHYSICS LETTERS
卷 480, 期 1-3, 页码 57-61出版社
ELSEVIER
DOI: 10.1016/j.cplett.2009.08.064
关键词
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资金
- Lundbeckfonden
- Internationales of the Universite Paris Sud
Photodissociation of the complex between protonated tryptamine, TryH(+), and 18-crown-6 ether (CE) was investigated. Absorption maxima of TryH(+) and TryH(+)(CE) are at 249 and 273 nm, respectively. Ions decay exponentially on a microsecond timescale, and mass spectra reveal that NH3 loss is an important channel even though CE targets this group. TD-DFT calculations identified an electronically excited state, where the photoactive electron is located in an antibonding orbital between C and NH3. Dissociation along this coordinate and CE rearrangement to the new charge site accounts for ammonia loss. Photodissociation in an electric field and time-of-flight measurements corroborate such a non-statistical bond-breakage. (C) 2009 Elsevier B.V. All rights reserved.
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