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Correlation Effects and Molecular Tumbling in NMR Studies of Solid Beta- (CH3)4Si
ILLINOIS UNIV AT URBANA WILLIAM A NOYES LAB
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The beta phase of high purity samples of tetramethylsilane TMS, CH34Si, was investigated between 77K and its melting point 174K employing static and rotating frame proton spin-lattice relaxation measurements. Activation energies and inverse frequency factors for both motions are derived and discussed. It is suggested that the presence of exponential proton magnitization decays in solids containing methyl groups may sometimes serve as an indication for the presence of reorientations of the molecular frame to which the methyl groups are attached.
APPROVED FOR PUBLIC RELEASE