Variations on the chemical shift of TMS.

  title={Variations on the chemical shift of TMS.},
  author={R. E. Hoffman},
  journal={Journal of magnetic resonance},
  volume={163 2},
The chemical shift of TMS is commonly assumed to be zero. However, it varies by over 1 ppm for 1H and 4 ppm for 13C and shows a correlation with the physical properties of the solvent. Using the commonly accepted convention that TMS always resonates at zero leads to significant errors when comparing chemical shifts in different solvents. A new method for measuring absolute chemical shift with a conventional NMR spectrometer is demonstrated. The observed chemical shift is corrected by measuring… CONTINUE READING

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