Where does the solvent peak appear for CDCl_3?

1 Answer
Manisit Das
Jun 3, 2015

Solvent peak appears in H^1 spectrum as deuteration is not 100% complete and residual proton signals can be observed.

The CDCl_3 solvent peak appears at 7.24 ppm with a multiplicity of 1 for H^1 spectrum and 77.23 with a multiplicity of 3 for C^13 spectrum.

Deuterium (H^2) has a spin quantum number (I) = 1, so n deuterium atoms will split a proton signal into 2*I*n+1 lines. This explains the multiplicity of 3 for n =1 in C^13 spectrum.

N.B. : * This is not a correct way to represent an isotope. * The superscript should go on the left of the atomic symbol. However due to limitation of the text editor, it's presented as follows.

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