Chemical shift computations on a crystallographic basis: some reflections and comments

被引:194
作者
Harris, Robin K. [1 ]
Hodgkinson, Paul [1 ]
Pickard, Chris J. [2 ]
Yates, Jonathan R. [3 ]
Zorin, Vadirn [1 ]
机构
[1] Univ Durham, Dept Chem, Durham DH1 3LE, England
[2] Univ St Andrews, Dept Phys & Astron, St Andrews KY16 9SS, Fife, Scotland
[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
关键词
chemical shifts; computation; assignments; NMR crystallography; organic compounds;
D O I
10.1002/mrc.2132
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Computations for chemical shifts of molecular organic compounds using the gauge-including projector augmented wave method and the NMR-CASTEP code are reviewed. The methods are briefly introduced, and some general aspects involving the sources of uncertainty in the results are explored. The limitations are outlined. Successful applications of the computations to problems of interpretation of NMR results are discussed and the range of areas in which useful information is obtained is illustrated by examples. The particular value of the computations for comparing shifts between resonances where the same chemical site is involved is emphasised. Such cases arise for shifts between different crystallographically independent molecules of the same chemical species, between polymorphs and for shift anisotropies and asymmetries. Copyright (c) 2007 John Wiley & Sons, Ltd.
引用
收藏
页码:S174 / S186
页数:13
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