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  Home > JCE Print > Journal of Chemical Education > Issues > 2008  > February  >
In the Laboratory
Why Are 1H NMR Integrations Not Perfect? An Inquiry-Based Exercise for Exploring the Relationship Between Spin Dynamics and NMR Integration in the Organic Lab
Haim Weizman
Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093-0303
Cover
February 2008
Vol. 85 No. 2
p. 294
Abstract
When FT-NMR is used to collect data without a sufficient delay time between subsequent pulses, the integrated area under certain peaks may result in a lower value than should be observed under appropriate conditions. This discrepancy in integration may deceive the inexperienced eye and consequently can lead to a wrong assignment of the NMR spectrum. The following exercise is designed to raise awareness of this issue in students and to serve as an inquiry-based stepping-stone into basic FT-NMR. The exercise can be conducted as part of an organic lab where the students are synthesizing a compound and analyzing its spectrum or as a theoretical exercise using the provided spectra.
Supplement
The synthetic procedure and NMR spectra are available.
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Contents
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Citation
Weizman, Haim. J. Chem. Educ. 2008, 85, 294.
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Keywords
Aldehydes / Ketones; Graduate Education / Research; Hands-On Learning / Manipulatives; Inquiry-Based / Discovery Learning; Laboratory Instruction; Mercury; Microscale Lab; NMR Spectroscopy; Organic Chemistry; Second-Year Undergraduate; Upper-Division Undergraduate
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History
Created:
Last Updated:
1/4/2008
1/9/2008
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