RESIDUAL CHEMICAL-SHIFT EFFECTS IN SPIN-ECHO NMR POWDER PATTERNS OF HOMONUCLEAR DIPOLAR-COUPLED SPINS

被引：16
|
作者：
NAKAI, T
MCDOWELL, CA
机构：
[1] Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1
来源：
CHEMICAL PHYSICS LETTERS | 1994年 / 217卷 / 03期
关键词：
D O I：
10.1016/0009-2614(93)E1359-O
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：
The effect of the spin-echo pulse sequence on homonuclear dipolar-coupled spins in solids has been studied. Precise analysis has revealed that the sequence may not yield simple Pake doublets but rather complicated patterns because of the imperfect refocusing of the chemical shifts. This strong-coupling effect has been verified experimentally through the measurement of the P-31 two-dimensional spin-echo powder pattern for polycrystalline tetraphenyldiphosphine; our choice of tetraphenyldiphosphine was fortunate because it transpired that the non-parallel chemical-shift tensors of the two P-31 nuclei in the compound yield the desired residual chemical-shift effects.
引用
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页码：234 / 238
页数：5
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