Proton relaxation NMR study of polycrystalline progesterone
Authors:
- E.R. Andrew,
- Kazimierz Jurga,
- J.M. Radomski,
- E.C. Reynhardt
Abstract
Polycrystalline progesterone (4-pregnene-3,20-dione, C21H30O2) has been investigated by proton NMR methods between 80 and 350 K. A reduction in dipolar second moment is ascribed to methyl group reorientation. Minima in the spin-lattice relaxation time found in measurements at five frequencies from 7 to 200 MHz are attributed to reorientation of two of the three methyl groups in each molecule, characterized by activation energy Ea = 10.9 ± 0.8 kJ/mol and τ0 = (2.3 ± 0.2) × 10-13, s. Additional relaxation at lower temperatures is attributed to reorientation of the third methyl group with Ea approximately 3.4 kJ/mol. Measurements were also made of relaxation in the rotating frame. © 1992.
- Record ID
- UAMc4e56d35102d432ea3e4f999ec2d9850
- Author
- Journal series
- Solid State Nuclear Magnetic Resonance, ISSN 0926-2040
- Issue year
- 1992
- Vol
- 1
- Pages
- 121-125
- ASJC Classification
- ; ; ;
- DOI
- DOI:10.1016/0926-2040(92)90012-X opening in a new tab
- Language
- en English
- Score (nominal)
- 25
- Score source
- journalList
- Publication indicators
- = 16.000; : 1999 = 0.742; : 2006 = 1.532 (2) - 2007=1.604 (5)
Share
- Uniform Resource Identifier
- https://researchportal.amu.edu.pl/info/article/UAMc4e56d35102d432ea3e4f999ec2d9850/
* presented citation count is obtained through Internet information analysis and it is close to the number calculated by the Publish or Perishopening in a new tab system.
Back