Two-dimensional transferred-echo double resonance study of molecular motion in a fluorinated polycarbonate

被引:18
作者
Goetz, JM [1 ]
Wu, JH
Yee, HF
Schaefer, J
机构
[1] Washington Univ, Dept Chem, St Louis, MO 63130 USA
[2] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA
基金
美国国家科学基金会;
关键词
two-dimensional transferred-echo double resonance; molecular motion; fluorinated polycarbonate; heteronuclear magnetic dipolar interactions; rare spins;
D O I
10.1016/S0926-2040(98)00055-1
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
A two-dimensional version of the transferred-echo double resonance (TEDOR) experiment is introduced to measure strong heteronuclear magnetic dipolar interactions between rare spins. A quantitative description of this 2D-TEDOR experiment is given for an I-S pair of spins undergoing relative motion. 2D-TEDOR calculations are consistent with data for a calibration model: the directly bound C-13-P-31 pair in [3-C-13]glyphosate, (HO3PCH2NHCH2COOH)-P-31-C-13. Analysis shows that the indirect spin-spin interaction and the dipole-dipole interaction have opposite signs in this system. The 2D-TEDOR experiment is then used to measure heteronuclear C-13-F-19 interactions in a fluorinated polycarbonate in which an aromatic proton is replaced by a fluorine on every fourth ring. Results from the 2D-TEDOR experiment show that the aromatic ring flips that occur in ordinary polycarbonate are blocked for a fluorinated ring. (C) 1998 Elsevier Science B.V. All rights reserved.
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页码:87 / 95
页数:9
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