13.10 Integration of 1H NMR Absorptions: Proton Counting
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NMR and IR Spectroscopy for the Structural Characterization of Edible Fats and OilsMolly W. Crowther This article describes an upper-level instrumental laboratory for undergraduates that explores the complementary nature of IR and NMR spectroscopy in the analysis of five edible and structurally similar fats and oils for average chain length, degree of unsaturation, and trans fat content. Crowther, Molly W. J. Chem. Educ.2008, 85, 1550.
Consumer Chemistry |
Food Science |
IR Spectroscopy |
NMR Spectroscopy |
Qualitative Analysis |
Spectroscopy |
Fatty Acids
Quantitative Analysis of Nail Polish Remover Using Nuclear Magnetic Resonance Spectroscopy RevisitedMarkus M. Hoffmann, Joshua T. Caccamis, Mark P. Heitz, and Kenneth D. Schlecht Substantial modifications intended for a second- or third-year laboratory course in analytical chemistry are presented for a previously described procedure using NMR spectroscopy to quantitatively determine analytes in commercial nail polish remover. The revised experiment introduces student collaboration to critically interpret a relatively large set of data. Hoffmann, Markus M.; Caccamis, Joshua T.; Heitz, Mark P.; Schlecht, Kenneth D. J. Chem. Educ.2008, 85, 1421.
Alcohols |
Aldehydes / Ketones |
Consumer Chemistry |
Instrumental Methods |
Laboratory Equipment / Apparatus |
NMR Spectroscopy |
Quantitative Analysis
"As Simple as Possible, but Not Simpler"—The Case of Dehydroascorbic AcidRobert C. Kerber Textbooks routinely assign dehydroascorbic acid a tricarbonyl structure that is highly improbable in aqueous solution and inconsistent with its colorless appearance. Studies of oxidized forms of ascorbic acid are summarized here, and a plea is entered for accurate descriptions of chemical structures in this and other cases, even at the cost of some simplicity. Kerber, Robert C. J. Chem. Educ.2008, 85, 1237.
Mechanisms That Interchange Axial and Equatorial Atoms in Fluxional ProcessesMarion E. Cass, Henry S. Rzepa, King Kuok Hii The Berry pseudorotation is a classical mechanism for interchanging axial and equatorial ligands in molecules with trigonal bipyramidal geometry. Teaching this mechanism presents particular pedagogic problems due to both its dynamic and three dimensional character. The approach taken here illustrates these processes using interactive animations embedded in a Web page and overcomes many limitations of a printed page.
