Write Up - Indigo Synthesis Author: Michelle Abercrombie...

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Indigo Synthesis Author: Michelle Abercrombie Lab Partners: Morgan Seidl, Crystal Murphy, Will Marcello Instructor: Ivan Ogloblin Chemistry 104B, section 19 Date work performed: 29 August 2007, 05 September 2007 Date work submitted: 12 September 2007 Abstract: Through this experiment we will be synthesizing indigo samples and then evaluating the properties of the popular dye. Overall in the experiment we found the percent yield in producing the indigo to be 106%. We also observed that worsted wool is the fabric that dyes the worst out of the fabrics dyed with leucoindigo. Experimentally, we also determined that the percent yield for the production of indigo disulfonic acid was that of 24.26%.
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In this experiment we will be investigating the synthesis of the common dye indigo and then using the created dye to evaluate several of indigo’s properties. Before investigating the properties of the dye indigo it is important to know about the dye and its history. The dye indigo originally extracted from the indigo plant from the pea family and is given the name indigo for its strong blue color. This dye has been used to dye fabrics such as cotton and wool and can be seen almost every day as the color that is used to dye blue jeans. The indigo dye was harvested from the indigo plant itself until 1856 when Sir William Henry Perkins developed a method for synthetically producing the indigo molecule. Since the original creation of synthetic indigo there have been many different methods of creating indigo. One of these methods which produces a large quantity of indigo and is relatively fast is that of the reaction between 2-nitrobenzaldhyde and acetone in a basic solution, 2C 7 H 5 NO 3 + 2C 3 H 6 O C 16 H 10 N 2 O 2 + 2CH 3 CO 2 H + 2H 2 O. With this reaction the indigo is simple to collect through the use of a filtration system due to the insolubility of indigo in water. Materials and Methods:
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This note was uploaded on 04/03/2008 for the course CHEM 104B taught by Professor Staff during the Winter '07 term at University of Arizona- Tucson.

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Write Up - Indigo Synthesis Author: Michelle Abercrombie...

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