Intracluster reaction, fragmentation, and structure of monomethylamine, dimethylamine, and trimethylamine cluster ions

W. B. Tzeng*, K. Narayanan, G. C. Chang, W. C. Tsai, J. J. Ho

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

24 引文 斯高帕斯(Scopus)

摘要

Ammonia, monomethylamine (MMA), dimethylamine (DMA), and trimethylamine (TMA) clusters, formed in a supersonic expansion, were investigated using a multiphoton ionization time-of-flight mass spectrometer. The observed major product ions resulting from prompt fragmentation following ionization are (NH3)nH+, (CH3NH2)nH+, [(CH3)2NH]nH+, and [(CH3)3N]nH+. Detection of stable CH2=NH2+ and (CH2=NH-CH3)+ immonium ions and other fragments provides evidence for molecular rearrangement and fragmentation within our observable time windows. Anomalously large relative intensities observed for (NH3)5H+, (CH3NH2)4H+, [(CH3)2NH]3H+, and [(CH3)3N]2H+ are attributed to enhanced stability of the cluster ions, due to the complete filling of hydrogen-bonding sites on the "central ions". Fully optimized geometries and stabilization energies of these cluster ions have been predicted using ab initio molecular orbital methods. The experimental findings are in very good agreement with the calculated results.

原文英語
頁(從 - 到)15340-15345
頁數6
期刊Journal of physical chemistry
100
發行號38
DOIs
出版狀態已發佈 - 1996 九月 19

ASJC Scopus subject areas

  • 工程 (全部)
  • 物理與理論化學

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