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Long‐range CH correlation 2D NMR spectroscopy 2 —effect of TANGO and BIRD pulses
Author(s) -
Krishnamurthy V. V.,
Casida John E.
Publication year - 1988
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260260504
Subject(s) - chemistry , pulse sequence , range (aeronautics) , pulse (music) , decoupling (probability) , two dimensional nuclear magnetic resonance spectroscopy , composite number , analytical chemistry (journal) , nuclear magnetic resonance , optics , stereochemistry , physics , organic chemistry , materials science , control engineering , detector , composite material , engineering
Abstract The basic CH correlation sequence, with the delays lengthened to facilitate long‐range correlations, was modified by using TANGO and BIRD pulses (both basic and composite) to facilitate both the suppression of one‐bond cross‐peaks and the decoupling of long‐range cross‐peak intensity modulations due to one‐bond coupling. The relative effectiveness of these modifications is illustrated with nicotinamide as a model compound. The use of a combination of the basic TANGO pulse and the basic BIRD pulse achieves both of these aims. The composite TANGO pulse can replace the basic TANGO pulse when more effective suppression of one‐bond cross‐peaks is needed. The use of the composite BIRD pulse during refocusing increases F 1 noise and artifacts and is therefore not recommended.