Molecular motion in solid hexamethylethane studied by nuclear magnetic resonance
作者： J.M. Chezeau , J. Dufourcq , J.H. Strange
DOI: 10.1080/00268977100100281
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摘要: The nuclear magnetic resonance line width and second moment for the molecular crystal hexamethylethane have been measured from 85°k to melting point, 374°k. spin-lattice relaxation time T 1 spinlattice in rotating frame 1σ also over same temperature range. results interpreted terms of various motions occurring crystal. Below thermal transition point at 152·5°k methyl group reorientation anisotropic appear occur simultaneously with correlation time. activation enthalpy this motion is 13·4±0·5 kJ mole-1. Above phase transition, measurements indicate isotropic reorientation, give an 9·2±0·5 mole-1 process. 250°k self-diffusion becomes dominant controlling mechanism 1p . process foun...
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