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Table 1
Proton
NMR Assignments for Functional Groups of Interest in petroleum
Chemistry
Peak
0.5-1.0
CH3 gamma
and further, some naphthenic CH and CH2
.Separation 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
alpha
to olefin. Only if a clear peak appears, associated with peaks at 4.5-6.0 ppm
2.1-2.4
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)