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Nuclear spin relaxation of oxygen-17, silicon-29 and carbon-13 in octamethylcyclotetrasiloxane

✍ Scribed by Jozef Kowalewski; Elisabet Berggren

Publisher
John Wiley and Sons
Year
1989
Tongue
English
Weight
505 KB
Volume
27
Category
Article
ISSN
0749-1581

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✦ Synopsis

0, I3C and 29Si nuclear magnetic relaxation data are reported for neat liquid octamethylcyclotetrasiloxane in the temperature range 298-373 K. The electric field gradient at the site of the oxygen nucleus is estimated by ab initio calculations and the "0 relaxation data are interpreted in terms of isotropic rotational diffusion. The "C dipoledipole relaxation rates are interpreted in terms of the Woessner model for internal methyl rotation superimposed on the isotropic overall tumbling. The 29Si spin-lattice relaxation is composed of dipoledipole and spinrotation contributions, which are interpreted in a semi-quantitative fashion.

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