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Use a Pasteur pipette to slowly add this suspension to the second test tube containing the Cl solution, with constant stirring using a glass rod. The other procedure is for the sulfonic acid substituted anilines. In practice, azo dye compounds come in yellows, oranges, reds, browns, and blues.
Describe the color of the solutions of coupling agent and diazonium salt.
Dorland's Medical Dictionary. Research is always continuing, though, so that now there are some viable blue azo dyes on the market2.
The general synthesis of azo dyes is shown below. Gaddis, B. Insert a photo of the dyed fabric labeled as a figure in your lab report.
UV radiation can cause a trans azo group to become cis. The diazonium salt is resonance stabilized: - 2 Diazonium salt Many diazonium salts are unstable and can be explosive when dry. Often, these carbons are part of aromatic systems, but this is not always the case. Dry the fabric overnight in a student hood.
If the test paper does not turn blue-violet after 30 sec , make more aliquots of the sodium nitrite solution, and slowly add small portions to the test tube with 4-nitroaniline and Cl. The other procedure is for the sulfonic acid substituted anilines. The general synthesis of azo dyes is shown below. However, not all azo dyes show tautomerism, and some tautomeric forms are more stable than others2. In another test tube, make a solution of 0.
Some azo dyes with this property and which can revert slowly to the trans isomer in the dark are used in sunglasses and car sunroofs. Synthesis of azo dyes An overview of azo dye synthesis is shown below: Stage 1- Diazotisation This involves a primary aromatic amine, called the diazo component. In another test tube, weigh 0. If there are any clumps of the azo dye, rinse the fabric well using tap water.