NMR STUDY OF HINDERED ROTATION IN SOLIDS
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Publisher:Ohio State University
NMR line shapes and spin-lattice relaxation times have been studied for methyl chloroform and methyl trichlorosilane dissolved in hexachloropropene from $4.2^\circ K$ to the melting point. The small intermolecular magnetic dipole-dipole interactions introduce line broadening of only $\sim$ 0.7 G and thus permit details of the line shapes to be resolved. Line shapes charcteristic of a rigid nonrotating triangle of spins are found below $77^\circ K$ for methyl chloroform, but methyl trichlorosilane exhibits a “fast rotation” spectrum even at 4.2$^\circ K$. The effects of thermally activated rotation and tunneling on the line shapes and spin-lattice relaxation times for these systems are discussed.
Author Institution: Department of Chemistry, University of North Carolina
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