Proton spin-lattice relaxation in MBDBP
| Autor: | Cheryl Schwamb, Meigan Aronson, Swee Lian Tan, Victoria Guerra, Peter A. Beckmann |
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| Rok vydání: | 1980 |
| Předmět: | |
| Zdroj: | Molecular Physics. 41:1239-1258 |
| ISSN: | 1362-3028 0026-8976 |
| DOI: | 10.1080/00268978000103521 |
| Popis: | We have measured the proton spin-lattice relaxation rate R in 4,4′-methylenebis(2,6-di-t-butylphenol) (MBDBP) and MBDBP-OD (deuteriated hydroxyl proton) between 88 K and 380 K. The experimental results are compared with those from a previous study in the closely related but simpler molecule 4-methyl-2,6-di-t-butylphenol (MDBP). The present experiment is analysed in terms of relaxation resulting from intramolecular reorientation modulation of the proton spin-spin interaction. This intramolecular reorientation involves different combinations of superpositions of methyl, t-butyl, aromatic ring and hydroxyl group reorientation and a discussion is presented concerning the effects on the relaxation of superimposing these motions. The MBDBP-OD data is best fitted with the assumption that only methyl and aromatic ring reorientations occur. In MBDBP it is found that, in addition, an OH flip-flop motion is superimposed on the aromatic ring reorientation. |
| Databáze: | OpenAIRE |
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