Abstract
The effects of molecular motions on the dipolar coupled 13C magic-angle-spinning (MAS) nuclear magnetic resonance (NMR) spectra of alkane—urea inclusion compounds and bis(ethylammonium) hexachlorostannate were investigated. The contact time dependences of 13C cross-polarization (CP) MAS NMR spectra were measured for the tridecane—urea inclusion compounds at the Hartman—Hahn condition and at the off-Hartman—Hahn condition. Rotational echoes were observed at a multiple of the rotational periods both in the dipolar dephasing experiments and the CP experiments. These rotational echo shapes were analyzed by the presently proposed theory.
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