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Tetramethylsilane (TMS) is the accepted internal standard for calibrating chemical shift ppm values for 1H, 13C,...

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Chemistry

Tetramethylsilane (TMS) is the accepted internal standard forcalibrating chemical shift ppm values for 1H, 13C, and 29Si NMRspectroscopy in organic solvents.

In 1H-NMR, the TMS peak is assigned 0 ppm. This is upfield ofmost proton peaks observed for organic compounds. Briefly explainwhy the protons in TMS appear at this upfield location in a 1H-NMRspectrum.

Considering the range of hertz values possible for aspectrometer, why is the ppm scale used? To what does the ppm scalerefer?

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