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A 1H NMR signal is observed at 162.0 Hz (downfield of TMS) on a 1.20 ×...

A 1H NMR signal is observed at 162.0 Hz (downfield of TMS) on a 1.20 × 102-MHz instrument. a) What is the observed chemical shift in parts per million (ppm)? b) What is the chemical shift, in parts per million (ppm), if the sample is analyzed with a 60.0-MHz instrument? c) Where will the proton signal appear, in hertz, if the sample is analyzed with a 60.0-MHz instrument?

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Answer #1

Frequency in Hertz / carrier frequency = Frequency in ppm

observed chemical shift in ppm = 162 Hz / 120 MHz = 1.35 ppm

b) What is the chemical shift, in parts per million (ppm), if the sample is analyzed with a 60.0-MHz instrument?

The chemical shift of the signal will be 1.35 ppm. ppm is an common unit. In any instrument the chemical shift of the signal will be 1.35 ppm.

Where will the proton signal appear, in hertz, if the sample is analyzed with a 60.0-MHz instrument?

Frequency in Hertz = 60 x 1.35 = 81 Hz

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