A 250 MHz 1H spectrum of a compound shows two peaks. The frequency of one peak...

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A 250 MHz 1H spectrum of a compound shows two peaks. The frequency of one peak...

A 250 MHz 1H spectrum of a compound shows two peaks. The frequency of one peak is 510 Hz higher than that of the reference compound (tetramethylsilane), and the second peak is at a frequency 170 Hz lower than that of the reference compound. What chemical shift should be assigned to these two peaks?

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Answer 1

Answer #1

the chemical shift for the peak with 510 Hz higher than reference is

chemical shift = frequency - reference frequency / instrument frequency in MHz

= 510 / 250

chemical shift = 2.04

so for the peak at 170 Hz lower than that of a reference compound

chemical shift = frequency - reference frequency / instrument frequency in MHz

= -170 / 250

chemical shift = - 0.68

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Answer 2

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