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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
A Green, Guided-Inquiry Based Electrophilic Aromatic Substitution for the Organic Chemistry LaboratoryEric Eby and S. Todd Deal This alternative, electrophilic aromatic substitutionan iodination reaction of salicylamide, a popular analgesicuses environmentally friendly reagents and serves as a guided-inquiry experiment in which students are asked to predict the orientation of the substitution reaction and determine the product's structure using FT-IR spectroscopy. Eby, Eric; Deal, S. Todd. J. Chem. Educ.2008, 85, 1426.
Aromatic Compounds |
Constitutional Isomers |
Electrophilic Substitution |
Green Chemistry |
IR Spectroscopy |
Synthesis
Isolation of Betulin and Rearrangement to AllobetulinBrian Green, Michael D. Bentley, Bong Y. Chung, Nicholas G. Lynch, and Bruce L. Jensen Betulin is obtained by extraction from birch bark and converted to allobetulin. Both compounds display 1H NMR spectra that include axialequatorial coupling characteristic of a C3-alcohol, conformational analysis by the use of dihedral angles and the Karplus equation, coupling patterns caused by diastereotopic protons and long-range interactions, and chemical shift values that are influenced by electronegativity and stereochemistry. Green, Brian; Bentley, Michael D.; Chung, Bong Y.; Lynch, Nicholas G.; Jensen, Bruce L. J. Chem. Educ.2007, 84, 1985.
The Spectra of Molecules: InfraredEd Vitz, John W. Moore A section of ChemPrime, the Chemical Educations Digital Library's free General Chemistry textbook.
IR Spectroscopy
3D NormalModes Shockwave; A Web Application for Interactive Visualization and Three Dimensional PercNickolas D. Charistos, C. A. Tsipis, Michael P. Sigalas 3D Normal Modes is a Web application for interactive visualization and three-dimensional perception of the normal modes of molecular vibration, suitable for undergraduate students in chemistry. The application uses the Macromedia Shockwave plug-in and has been designed and developed especially for the Web. It has a simple graphical user interface and requires a download of only 120 KB, allowing it to be used even with low bandwidth Internet connections. Its performance is comparable to a desktop application.
IR Spectroscopy |
Raman Spectroscopy
The Effect of Anharmonicity on Diatomic Vibration; A Spreadsheet SimulationWilliam F. Coleman, Kieran F. Lim Instructors and students can use this spreadsheet to quickly and easily observe how the shape of a one-dimensional vibrational potential energy curve and its associated vibrational quantum energy levels depend on the anharmonicity. This illustrates the connection between the harmonic (approximation) and anharmonic descriptions of molecular vibrations.
