Molecular dynamics in solid anhydrous beta-estradiol studied by 1H NMR. |
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Authors: | E R Andrew M Kempka J M Radomski E Szczesniak |
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Affiliation: | Department of Physics, University of Florida, Gainesville, 32611, USA. |
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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. |
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