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Improved pulse sequences for measurement of small long-range couplings between heteronuclei (29Si13C) at natural abundance

✍ Scribed by Vratislav Blechta; Jan Schraml

Publisher: John Wiley and Sons
Year: 2009
Tongue: English
Weight: 161 KB
Volume: 47
Category: Article
ISSN: 0749-1581
DOI: 10.1002/mrc.2417

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✦ Synopsis

Abstract

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.

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## Abstract Schemes for sensitive measurements of spin–spin coupling constants between rare nuclei with low magnetogyric ratios are considered and two combinations of INEPT with gradient versions of (X,Y)HMQC and (X,Y)COSY are suggested as particularly suitable for ^29^Si,^13^C couplings. It is dem