NMR exercises
NMR spectral interpretation based on examples
Picture of a FID

The chaos of multiplets

When you look at an NMR spectrum, do you see only a bunch of disordered lines or peaks? Then you have come to the right place. This site was established to provide people interested in NMR with a library of NMR spectroscopy problems. Interpretation of spectra is a skill that requires pattern recognition and/or practice to master the chaos. This site provides one dimensional spectra of different nuclei, COSY, HSQC, HMBC and some less common spectra of various compounds for you to interpret, together with worked solutions. Hopefully, these problems will provide a useful resource to help you better understand NMR spectral interpretation.

Legacy notice

A series of about 50 problems is available in printable form. The print version will not be developed further. The PDF documents are still available (german only). Get them here:

Not satisfied with the online spectra quality?

The step-by-step approach works nearly perfectly on the desktop and most tablets. On cellular phones, PowerPoint documents are sometimes displayed incorrectly. There is a workaround, but it is unfortunately much too complicated to be practical. As an alternative, all documents can be saved locally. Feel free to follow the download links. A free PowerPoint viewer is available in both the iOS and Android AppStores. As a bonus, there would be no need for a permanent internet connection. Of course, this offline method also works with desktop computers.

Feedback

The author is always grateful for criticism, suggestions, references to errors and information about the design via email:

Introduc­tion

Coupling constants

2D-NMR

Non categorized examples

Spin systems

Problem of the month (shadow copy)