COHERENT AND INCOHERENT MAGNETIZATION TRANSFER IN THE ROTATING FRAME

被引:23
作者
HWANG, TL [1 ]
KADKHODAEI, M [1 ]
MOHEBBI, A [1 ]
SHAKA, AJ [1 ]
机构
[1] UNIV CALIF IRVINE,DEPT CHEM,IRVINE,CA 92717
关键词
SELECTIVE MAGNETIZATION TRANSFER; CROSS-POLARIZATION; ROTATING FRAME; TOCSY; ROESY; FLOPSY;
D O I
10.1002/mrc.1260301308
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Two-dimensional (2D) NMR spectroscopy has become a routine part of molecular structure determination in liquids.In most modern experiments there is some correlation of transition frequencies between the two dimensions, and the mechanism responsible for the correlation dictates the information obtainable from the 2D spectrum. Two distinct mechanisms for magnetization transfer are considered: scalar coupling and cross-relaxation. The former gives rise to information about the proximity of spins through the electronic framework of the molecule and the latter provides information on spatial proximity and molecular motion. Two-dimensional experiments of both types are described, concentrating in particular on TOCSY and ROESY. It is shown how polarization transfer can be tailored and controlled, and how the unwanted coherent transfer due to J coupling can be eliminated in the ROESY experiment. Throughout the discussion, the multiple-pulse sequence used for each experiment is the central focal point, and its design and analysis are the main considerations.
引用
收藏
页码:S24 / S34
页数:11
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