Premium
Improved pulse sequences for measurement of small long‐range couplings between heteronuclei ( 29 Si 13 C) at natural abundance
Author(s) -
Blechta Vratislav,
Schraml Jan
Publication year - 2009
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.2417
Subject(s) - chemistry , pulse sequence , decoupling (probability) , spectral line , natural abundance , range (aeronautics) , pulse (music) , proton , analytical chemistry (journal) , nuclear magnetic resonance , physics , nuclear physics , optics , mass spectrometry , materials science , chromatography , astronomy , control engineering , detector , engineering , composite material
The gradient pulse sequences for measurement of small long‐range couplings between heteronuclei ( 29 Si 13 C) in natural abundance reported to date (INEPT‐(Si,C)gCOSY and INEPT‐(Si,C,Si)HMQC) suffer from significant signal loss when these nuclei ( 29 Si, 13 C) are coupled through one‐bond couplings to protons. This negative effect can be completely eliminated by using non‐gradient versions (INEPT‐(Si,C)COSY) or by switching proton decoupling off during gradient pulses (modified INEPT‐(Si,C,Si)gHMQC pulse sequence). The beneficial effects of these two approaches on the quality of the spectra are demonstrated here. Copyright © 2009 John Wiley & Sons, Ltd.