An improved 33S nuclear magnetic shielding scale from the gas-phase study of COS
✍ Scribed by Karol Jackowski; Włodzimierz Makulski; Wiktor Koźmiński
- Publisher
- John Wiley and Sons
- Year
- 2002
- Tongue
- English
- Weight
- 83 KB
- Volume
- 40
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1062
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✦ Synopsis
Abstract
The ^33^S NMR signal of gaseous carbonyl sulfide (COS) was monitored as a function of density for the first time. An extrapolation to the zero‐density limit permitted the measurement of nuclear magnetic shielding of an isolated COS molecule. An improved ^33^S shielding scale was established taking the value of 817(12) ppm as the absolute shielding of COS. The new ^33^S shielding scale is certainly more accurate than any previous estimation and contains some reference standards, e.g. an isolated SF~6~ molecule, a saturated solution of (NH~4~)~2~SO~4~ in D~2~O, 2 M aqueous Cs~2~SO~4~ solution or liquid SF~6~, CS~2~ and SO~2~. The latter results can be applied for the easy estimation of sulfur shielding available from all the measurements of ^33^S NMR chemical shifts. Copyright © 2002 John Wiley & Sons, Ltd.