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Organic Spectroscopy Laboratory: Utilizing IR and NMR in the Identification of an Unknown Substance
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Abstract
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.
Keywords (Audience):
Second-Year UndergraduateKeywords (Domain):
Laboratory InstructionKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
IR SpectroscopyTools
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- Received: August 03, 2009
ACS
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