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One‐dimensional pulse technique for detection of quaternary carbons
Author(s) -
Gowda G. A. Nagana
Publication year - 2001
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.882
Subject(s) - dephasing , chemistry , magnetization , protonation , pulse (music) , decoupling (probability) , quaternary , heteronuclear molecule , field (mathematics) , carbon fibers , pulse sequence , spectral line , quaternary carbon , analytical chemistry (journal) , nuclear magnetic resonance , magnetic field , condensed matter physics , optics , nuclear magnetic resonance spectroscopy , algorithm , organic chemistry , physics , ion , catalysis , mathematics , detector , enantioselective synthesis , biology , paleontology , quantum mechanics , control engineering , astronomy , pure mathematics , composite number , computer science , engineering
A one‐dimensional pulse scheme employing pulsed field gradients for detecting only quaternary carbons is reported. This new scheme, referred to as PFG‐QCD (pulsed field gradient quaternary carbon detection), suppresses primary, secondary and tertiary (CH 3 , CH 2 and CH) carbons very efficiently by creating their antiphase magnetization and then either dephasing the antiphase magnetization using pulsed field gradients or by the introduction of proton decoupling to the antiphase carbon magnetization. The experimental results of the new technique also demonstrate that mis‐setting of the parameters such as the τ delay and the pulse widths does not appreciably degrade the quality of the resultant spectrum. The proposed method provides spectra which are superior, in terms of suppression of unwanted protonated carbon signals, to the other editing methods and thus provides a useful alternative technique for routine applications. Copyright © 2001 John Wiley & Sons, Ltd.