期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 112, 期 22, 页码 4869-4874出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp802020n
关键词
-
Gas phase C6H7+ and C7H9+ ions are studied with infrared photodissociation spectroscopy (IRPD) and the method of rare gas tagging. The ions are produced in a pulsed electric discharge supersonic expansion source from benzene or toluene precursors. We observe exclusively the formation of either the C-2 upsilon benzenium ion (protonated benzene) or the para isomer of the toluenium ion (protonated toluene). The infrared spectral signatures associated with each ion are established between 750 and 3400 cm(-1). Comparing the gas phase spectrum of the benzenium ion to the spectrum obtained in a superacid matrix [Perkampus, H. H.; Baumgarten, E. Angew. Chem. Int. Ed. 1964, 3, 776], we find that the C-2 upsilon structure of the gas phase species is minimally affected by the matrix environment. An intense band near 1610 cm(-1) is observed for both ions and is indicative of the allylic pi-electron density associated with the six membered ring in these systems. This spectral signature, also observed for alkyl substituted benzenium ions and protonated naphthalene, compares favorably with the interstellar, unidentified infrared emission band near 6.2 mu m (1613 cm(-1)).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据