Ammonium Sulfate as a Standard for <SUP>33</SUP>S-NMR Spectra

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  • KOSUGI Yoshio
    Department of Applied Chemistry, School of Engineering, Nagoya University

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  • <SUP>33</SUP>S-NMR スペクトルの基準物質としての硫酸アンモニウム
  • 33S NMR スペクトル ノ キジュン ブッシツ トシテノ リュウサン アン

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Ammonium sulfate was found possibly useful as a standard for the chemical shift and line-width of sulfur-33 NMR. 2 M aqueous solution gave a signal with S/N larger than 4 in 1013 s and, thus show-ing it useful for probe tuning and matching as well as deciding on optimum pulse conditions in a short time. A line-width relative to that of ammonium sulfate or a reference was essentially constant for all pulse conditions. Thus, by measuring the line-width of signals at any experimental pulse condition linewidth can be expressed for any of the following standard pulse conditions : spectral width of 1500 Hz, data points of 4 K, pulse width π/2, pulse delay time of 0.1 s, and a line broadening factor of 5 Hz, by which ammonium sulfate of 1 M solution gives a width of 8.5 Hz. The present method is applicable to all other insensitive and broad NMR spectra.

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