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Chemistry of Dyes: Coumarin Dyes and Their Applications

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Chemistry of Dyes: Coumarin Dyes and Their Applications

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Questions and Answers

What type of dyes were prepared from the imidazole derivative in the text?

Azo dyes with high absorptivity on polyester and polyamide fabrics

Heterocyclic dyes containing 5-membered ring with two nitrogen heteroatoms (correct)

Phthalocyanine dyes suitable for natural fibers

Anthraquinone dyes with excellent light fastness

What are solvatochromic dyes used for?

Predicting suitable solvents for particular uses

Synthesizing imidazole derivatives

Enhancing light fastness of fabrics

Measuring solvent parameters and explaining solubility phenomena (correct)

What is the solvatochromic effect?

The process of synthesizing dyes from imidazole derivatives

The variation in the spectrum of a substance when dissolved in different solvents (correct)

The prediction of suitable solvents for particular uses

The measurement of solvent parameters using solvatochromic dyes

What is the primary drawback of the dyes prepared from the imidazole derivative?

Poor light fastness Signup and view all the answers

What is the process of synthesizing the bright red dyes from the imidazole derivative?

Diazotization followed by coupling to produce corresponding diazonium salt Signup and view all the answers

What is the primary purpose of using solvatochromic dyes?

To measure solvent parameters and explain solubility phenomena Signup and view all the answers

What type of dyes were prepared from the imidazole derivative mentioned in the text?

Heterocyclic dyes containing 5-membered ring with two nitrogen heteroatoms Signup and view all the answers

What is the significance of the solvatochromic effect?

It explains how the spectrum of a substance varies when dissolved in different solvents Signup and view all the answers

What process was involved in preparing bright red dyes from the imidazole derivative?

Diazotization followed by coupling Signup and view all the answers

What is the main application of the dyes prepared from the imidazole derivative?

Coloring polyester and polyamide fabrics Signup and view all the answers

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.

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Description

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.