Single crystals are difficult if not impossible to obtain. Examples are synthetic liquid crystalline and biological polymers. Often such materials can, however, be partially oriented. If a set of rotor-synchronized **1**3C MAS NMR spectra is taken of a macroscopically anisotropic sample for different initial rotor phases, a two-dimensional sideband spectrum can be generated by a subsequent second Fourier transformation over the rotor phase. From the sideband intensities in the new dimension the orientational distribution function can be derived for the individual carbon positions. The method is reviewed and demonstrated on samples of liquid crystalline polymers and drawn polyethylene terephthalate.
|Original language||English (US)|
|Number of pages||4|
|Journal||Berichte der Bunsengesellschaft/Physical Chemistry Chemical Physics|
|Publication status||Published - Nov 1 1987|
ASJC Scopus subject areas
- Chemical Engineering(all)