Molecular dynamics in solid anhydrous beta-estradiol studied by 1H NMR.
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.
Andrew
E R
ER
Department of Physics, University of Florida, Gainesville, 32611, USA.
Kempka
M
M
Radomski
J M
JM
Szczesniak
E
E
D004958:Estradiol / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D013696:Temperature
D004958:Estradiol