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2005
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In the Laboratory
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Organic Spectroscopy Laboratory: Utilizing IR and NMR in the Identification of an Unknown Substance
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Neil M. Glagovich and Timothy D. Shine
Department of Chemistry, Central Connecticut State University, New Britain, CT 06050
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September 2005
Vol. 82 No. 9
p. 1382
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| Abstract |
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An undergraduate organic laboratory designed to teach the use of IR and NMR spectra interpretation in the identification of an unknown substance has been developed. This laboratory requires the student to obtain the IR spectrum of an unknown substance and, from the interpretation of that spectrum, determine which of several possible functional groups is present in the molecule. Using this information and either the melting point or boiling point of the unknown, the student is able to determine a list of likely candidates (usually between eight and twelve suspects collated from a supplied table of possible compounds). The student will then draw the structures for all candidate compounds and, from those structures, predict the 1H- and 13C-NMR spectra for each. The student then acquires the 1H- and 13C-NMR spectra for the unknown substance for interpretation. Comparison of the actual NMR data to the predicted data for each candidate will lead to the identity of the unknown substance. The experiment can be performed for both solid and liquid unknown organic compounds and gives the student exposure to the appropriate use of both IR and NMR data. The laboratory can also be extended to incorporate organic compounds already in the local chemical stores.
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| Supplement |
A detailed student handout, which includes the experimental procedure, a solved example, and tables of possible unknowns (sorted by functional group and state) and instructor's notes, which contain the 1H- and 13C-NMR spectra for each unknown used in the experiment, lists of all hazards for each unknown, and lists of equipment, supplies, and other reagents necessary for the experiment are available
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 Contents |
JCE2005p1382W.doc (Microsoft Word)
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| Download |
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| More Information |
Citation |
Glagovich, Neil M.; Shine, Timothy D. J. Chem. Educ. 2005 82 1382.
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Keywords |
Hands-On Learning / Manipulatives; IR Spectroscopy; Laboratory Instruction; Liquids; NMR Spectroscopy; Organic Chemistry; Qualitative Analysis; Second-Year Undergraduate; Solids
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History |
Created:
Last Updated: |
August 2, 2005
August 10, 2005
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| Home > JCE Print > Journal of Chemical Education > Issues >
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