What does the "chemical shift" term mean in the NMR spectrum?

Question

What does the "chemical shift" term mean in the NMR spectrum?

1 Answer

Impact of this question

2770 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-06-13T04:14:28

An old story....

Explanation:

In NMR spectroscopy we often use a material that gives a specific resonance frequency as a reference for the resonance frequencies of unknown materials.

And we look at the defining equation....

$δ_{chemical shift} = \frac{ν_{sample} - ν_{reference}}{ν_{reference}}$ $delta_"chemical shift"=(nu_"sample"-nu_"reference")/(nu_"reference")$

Now the numerator thus has units of $H z$ $Hz$ ...the denominator has units of $M H z \equiv 10^{6} \cdot H z$ $MHz-=10^6*Hz$ ...

...and thus we get the QUOTIENT... $\frac{H z}{M H z} = \frac{s^{- 1}}{s^{- 1} \times 10^{6}} = \frac{1}{1000000} = 1 \cdot part per million$ $(Hz)/(MHz)=s^-1/(s^-1xx10^6)=1/1000000=1*"part per million"$

Science

Math

Humanities

... and beyond

What does the "chemical shift" term mean in the NMR spectrum?

1 Answer

Explanation:

Related questions

Impact of this question