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Science 5 November 1999:
Vol. 286. no. 5442, p. 1049
DOI: 10.1126/science.286.5442.1049u
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This Week in Science
White et al. (Reports, 2 Apr., p. 135) reported the infrared spectrum of CH5+, and Marx and Parrinello (Perspectives, 2 Apr., p. 59) reviewed recent theoretical work which suggests that the bonds in this species are highly fluxional.Kramer comments that previous mass spectrometry studies suggest that, in the absence of intermolecular collisions, CH4D+ and CD4H+ are not rearranging and can be described as a van der Waals complex of a methyl cation and a hydrogen molecule.In response, Oka and White point out some difficulties in the interpretation of the mass spectrometry cited and note that a more static structure would still have a complex infrared spectrum. Marx and Parrinello have performed additional calculations on CH4D+ that show scrambling of the D atom, and note that complexation may "freeze" the scrambling of the H atoms.The full text of these comments can be seen at www.sciencemag.org/cgi/content/full/286/5442/1051a
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
