Nuclear Magnetic Resonance of Trapped Molecules

概要

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Proton magnetic resonance spectra of benzene, aniline and like molecules confined in the cage of the dicyan-ammine-nickel clathrate have revealed that all the trapped molecules other than benzene are generally fixed in the cavities except for the reorientations of their constituent atomic groups. Benzene is the only one exception studied so far to the fact that the rotational transition of the trapped molecule occur at tem-perature lower than that of the molecule in its own crystal. A height of the potential barrier to rotation of the trapped benzene molecule was found to be 4.0kcal/mole. The shift of the resonance line of the trapped benzene molecules at 4.2°K has confirmed that no electronic binding exists between the benzene molecule and the nickel ions. Disappearance of the proton resonance line has been noticed in benzene clathrate at about 2°K. The adduct of cyclohexane molecules trapped in the channel of thiourea, is also examined in comparison with the results of solid cyclohexane.
社団法人日本物理学会の論文
1965-04-05