MOLECULAR-DYNAMICS IN POLYCRYSTALLINE TESTOSTERONE STUDIED BY PROTON NMR

被引：28

作者：

ANDREW, ER ^{[1
]}

RADOMSKI, JM ^{[1
]}

机构：

[1] UNIV FLORIDA,DEPT RADIOL,GAINESVILLE,FL 32611

来源：

SOLID STATE NUCLEAR MAGNETIC RESONANCE | 1993年 / 2卷 / 1-2期

关键词：

TESTOSTERONE; PROTON NMR; RELAXATION; MOLECULAR DYNAMICS; METHYL ROTATION;

D O I：

10.1016/0926-2040(93)90063-S

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Polycrystalline testosterone (17beta-hydroxy-4-androsten-3-one, C19H28O2) has been investigated by proton NMR methods between 70 K and the melting point 428 K. Reductions in dipolar second moment and two well-resolved minima in the spin-lattice relaxation time measured at 25 MHz are ascribed to reorientation of the two methyl groups in the molecule. Activation energies E(a) characterizing the motions were 6.1+/-0.5 and 11.9+/-0.9 kJ/mol; the pre-exponential time factors tau0 were (2.3+/-0.1)x10(-13) and (2.85+/-0.2)x10(-13) s, respectively.

引用

页码：57 / 60

页数：4

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