10 Questions
What type of dyes were prepared from the imidazole derivative in the text?
Heterocyclic dyes containing 5-membered ring with two nitrogen heteroatoms
What are solvatochromic dyes used for?
Measuring solvent parameters and explaining solubility phenomena
What is the solvatochromic effect?
The variation in the spectrum of a substance when dissolved in different solvents
What is the primary drawback of the dyes prepared from the imidazole derivative?
Poor light fastness
What is the process of synthesizing the bright red dyes from the imidazole derivative?
Diazotization followed by coupling to produce corresponding diazonium salt
What is the primary purpose of using solvatochromic dyes?
To measure solvent parameters and explain solubility phenomena
What type of dyes were prepared from the imidazole derivative mentioned in the text?
Heterocyclic dyes containing 5-membered ring with two nitrogen heteroatoms
What is the significance of the solvatochromic effect?
It explains how the spectrum of a substance varies when dissolved in different solvents
What process was involved in preparing bright red dyes from the imidazole derivative?
Diazotization followed by coupling
What is the main application of the dyes prepared from the imidazole derivative?
Coloring polyester and polyamide fabrics
Study Notes
Heterocyclic Dyes
SIX-MEMBERED RINGS CONTAINING OXYGEN
- Coumarins are an important class of pyranoid dyes.
- C.I. Disperse Yellow 232 (1) is used to dye polyester a bright yellow shade.
- Kodak's Coumarin 152 (2) is used in dye lasers.
- Other common applications of coumarin dye lasers include:
- Insecticides
- Food preservatives
- Cosmetics
- Dye lasers use a liquid as the active medium to produce a specific spectral range.
FIVE-MEMBERED RINGS CONTAINING SULFUR
- Thiophene rings can be incorporated into a coupling component for the preparation of heterocyclic azo dyes.
- Dye 2 was produced from the coupling of p-nitrodiazobenzene onto the dimethylamino bithiophene 1.
- A series of such dyes was prepared by varying the diazo component to provide thermally stable solvatochromatic dyes.
Explore the chemistry of coumarin dyes and their unique applications in dyeing polyester, dye lasers, insecticides, food preservatives, and cosmetics. Learn about the heterocyclic dye Coumarin 152 and C.I. Disperse Yellow 232.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
