Organic Lab IR

Organic Lab IR - Experiment #11 IR Spectroscopy Purpose The...

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Experiment #11 IR Spectroscopy Purpose The aim of the experiment is to use the methods of IR spectroscopy to discern whether or not the structures of the synthesized products of aspirin and copper aspirinate are correct. Purpose of IR spectroscopy IR spectroscopy is used to obtain specific information on the structural features of the molecules being studied. Instrument Details The type of detector used was thermocouples. The radiation source was a helium-neon laser. Methods of Sample Preparation There are two general methods for preparing both solid and liquid samples for IR spectroscopy. The first general technique for liquid samples is to place several drops of the sample on the center of a NaCl plate. The sample must evaporate in order to allow a thin film to form on the plate. Once the sample has evaporated, a second NaCl plate is placed on top of the first one in order to produce an even film of liquid. The advantage of using a liquid sampling technique is that there are no other compounds that can show up on the IR spectroscopy. However one of the major flaws of using this technique is that the NaCl plates are extremely delicate, as in they cleave very easily and the plates dissolve when exposed to water
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Organic Lab IR - Experiment #11 IR Spectroscopy Purpose The...

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