Study of the dynamics of ferrocene enclathrated in β‐ and γ‐cyclodextrins by one‐dimensional switching‐angle sample spinning NMR spectroscopy
1992; Wiley; Volume: 30; Issue: 8 Linguagem: Inglês
10.1002/mrc.1260300817
ISSN1097-458X
AutoresFumio Imashiro, Daisuke Kuwahara, Nobuyuki Kitazaki, Takehiko Terao,
Tópico(s)NMR spectroscopy and applications
ResumoAbstract 13 C chemical shift powder patterns of ferrocene enclathrated in β‐ and γ‐cyclodextrins were measured by one‐dimensional switching‐angle sample spinning NMR spectroscopy. The ferrocene molecules were found to precess with a precession angle of 69° in γ‐cyclodextrin. In β‐cyclodextrin the ferrocene molecules I–III, in different motional states, were enclathrated with populations of 0.42, 0.32 and 0.26, respectively; ferrocene I is tightly enclathrated and rotates around its fivefold axis, whereas ferrocenes II and III precess with precession angles of 30° and 42°, respectively.
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