Common Chemical Shift Values

Between 0-5 δ, OH and NH proton signals may appear.
The chemical shifts for these protons present special problems. An OH group map appear nearly anywhere in the spectrum and the observed chemical shift is dependent on a number of things such as concentration, solvent and trace impurities.
One method used for determining whether a peak is due to an OH group is that of deuterium exchange. By treatment with D2O, the hydrogens often rapidly exchange and the peak then disappears.
Hydrogens attached to nitrogen atoms may not show up at all in a spectrum or they may be extremely broad and unresolved.
Return to Introduction to NMR

Dr Bird logoReturn to Chemistry, UWI-Mona, Home Page

Copyright © 2003 by Robert John Lancashire, all rights reserved.

Created and maintained by Prof. Robert J. Lancashire,
The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.
Created December 1994. Links checked and/or last modified 6th January 2003.