title: Molecular dynamics in solid anhydrous beta-estradiol studied by 1H NMR.
abstract: Proton second moment and spin-lattice relaxation times T1 and T1p in solid anhydrous beta-estradiol are measured as a function of temperature. The results show that the C3 reorientation of the single methyl group provides the mechanism dominating relaxation at low temperatures and reveal the existence of a conformational motion of the carbon skeleton dominating relaxation at high temperatures. The activation energies of the respective motions are found to be 9.3 and 37.3 kJ/mol.
authors.affiliation: Department of Physics, University of Florida, Gainesville, 32611, USA.
authors.forename: E R
authors.initials: ER
authors.lastname: Andrew
authors.forename: M
authors.initials: M
authors.lastname: Kempka
authors.forename: J M
authors.initials: JM
authors.lastname: Radomski
authors.forename: E
authors.initials: E
authors.lastname: Szczesniak
mesh_terms: D004958:Estradiol / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D013696:Temperature
chemical_list: D004958:Estradiol