Indigo_Synthesis - Indigo Synthesis Parker Ashbaugh Chem....

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Indigo Synthesis Parker Ashbaugh Chem. 104B Section 09 11/05/2007 TA: Tim Black Abstract: In this lab the synthesis of indigo was analyzed. It was found that a percent yield of indigo from 2-nitrobenzaldehyde was 107% and the conversion of indigo to Indigo Carmine was 100%. It was also found that the indigo produced was Blue #2 Indigo Carmine through the use of spectrophotmetry. The lab resulted in error and values that were not very accurate.
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I. Introduction In this lab the common dye known as indigo (C 16 H 10 N 2 O 2 ) will be produced and analyzed. Indigos are commonly used in the dying of fabrics as well as in the medical field. They are characterized by their blue to violet color. In this lab indigo will be synthesized from the reaction of 2-nitrobenzaldehyde (C 7 H 5 NO 3 ) with acetone (CH 3 COCH 3 ) in a basic solution. During the duration of the reaction, the indigo rapidly precipitates out of solution and then is isolated using the vacuum filtration. The indigo produced is in an insoluble form and is not adequate for dyeing fabrics. Because of this the indigo must be reduced to leucoindigo, which is soluble in water and can therefore be used as a dye. The dye works by re-oxidizing the leucoindigo with the air which causes the dye to adhere to the fabric molecules. As the dye is allowed to re-oxidize the fabric begin to gain the characteristic blue color of indigos. In the lab the indigo was then converted into Indigo Carmine. This was done in
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This note was uploaded on 04/03/2008 for the course CHEM 103B taught by Professor Keller during the Spring '08 term at University of Arizona- Tucson.

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Indigo_Synthesis - Indigo Synthesis Parker Ashbaugh Chem....

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