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CH1012
INFORMATION FROM
NMR
A. Chemical Shifts
Internal Standard: Peak positions are measured relative to an internal standard that is placed in the NMR tube with the sample.
Tetramethylsilane (TMS) (CH3)4Si
- the standard used for organic solvents
- the standard used for organic solvents
units
of d (delta) scale:
1d = 1 ppm
1 ppm = 1
part per million of the spectromet. operating frequency (eg. 300 MHz)
The d scale is therefore independent of the spectrometer frequency.
