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Chemical Shift Table 1

Proton NMR Assignments for Functional Groups of Interest in Petroleum Chemistry.

Peak Position*	Assignment (comments)

0.5 - 1.0	CH₃ gamma and further naphthenic CH and CH₂ seperation at 1.0 ppm is generally not base resolved.

1.0 - 1.7	CH₂ beta and further. Some beta CH. Separation at 1.7 ppm is generally not base resolved.

1.7 - 1.9	Most CH, CH₂, beta hydro-aromatic. This shoulder is one of the best available ways to estimate hydro-aromaticity.

1.9 - 2.1	CH₃ alpha to aromatic carbons. Separation at 2.4 ppm is generally not base resolved.

2.4 - 3.5	CH, CH₂ alpha to aromatic carbons.

3.5 - 4.5	CH₂ bridge (diphenylmethane)

4.5 - 6.0	Olefinic-H

6.0 - 7.2	Single ring aromatic H.

7.2 - 8.3	Diaromatic and most of tri and tetra-aromatic.

8.3 - 8.9	Some tri and tetra-aromatic rings.

8.9 - 9.3	Some tetra-aromatic rings.

* Referenced to TMS (tetramethylsilane) at 0 ppm (units = ppm)

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