NMR Relaxation Studies of Solid Hexamethylethane and Hexamethyldisilane.
Abstract
Pulsed NMR studies in the static and rotating frames of the proton spin-lattice relaxation time were carried out on solid hexamethylethane (HME) (CH3)3CC(CH3)3 and hexamethyldisilane (HMDS) (CH3)3SiSi(CH3)3 beteen 77K and the melting point. In the low temperature phase of HMDS, the proton relaxation produced by reorientation of the CH3 group about its three-fold axis (C3 rotation) is resolved from that produced by reorientation of the molecule about its three-fold axis (C3' rotation). In HME the effects of the two types of rotation are combined, and have an apparent activation energy of 3.10 plus or minus 0.15 kcal/mole. In the high temperature phase of both solids, self diffusion as well as overall molecular reorientation or tumbling governs the proton relaxation. The properties of these two compounds are discussed briefly in relaxation to the NMR and thermodynamic studies of them. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 23, 1971
- Accession Number
- AD0729332
Entities
People
- Herbert S. Gutowsky
- J. A. Ripmeester
- S. Albert
Organizations
- University of Illinois Urbana–Champaign