Reactive Red 2
[CAS# 17804-49-8]

Identification

• Classification: Dyes and pigments >> Dyes >> Reactive dye (reactive dye)
• Name: Reactive Red 2
• Synonyms: Disodium 5-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]-4-hydroxy-3-(phenylazo)naphthalene-2,7-disulphonate
• Molecular Formula: C₁₉H₁₀Cl₂N₆O₇S₂.₂Na
• Molecular Weight: 615.33
• CAS Registry Number: 17804-49-8 (12226-03-8)
• EC Number: 241-776-2
• SMILES: C1=CC=C(C=C1)N=NC2=C(C3=C(C=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])NC4=NC(=NC(=N4)Cl)Cl)O.[Na+].[Na+]

Properties

• Melting point: >300 °C

Safety Data

• Hazard Symbols: GHS07;GHS08 Danger
• Risk Statements: H317-H319-H334-H412
• Safety Statements: P233-P260-P261-P264+P265-P271-P272-P273-P280-P284-P302+P352-P304+P340-P305+P351+P338-P321-P333+P317-P337+P317-P342+P316-P362+P364-P403-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Eye irritation	Eye Irrit.	2	H319
Respiratory sensitization	Resp. Sens.	1	H334
Skin sensitization	Skin Sens.	1	H317
Chronic hazardous to the aquatic environment	Aquatic Chronic	3	H412

Discovery and Applications

Reactive Red 2 is a synthetic dye introduced in the late 20th century, known for its vivid red coloration and versatile applications in various industries. It belongs to the class of reactive dyes, which are characterized by their ability to form covalent bonds with fibers, leading to vibrant and durable colors.

One of the primary applications of Reactive Red 2 is in the textile industry. The dye is widely used to color natural fibers such as cotton, wool, and silk, as well as synthetic fibers like nylon. Its reactive nature allows it to form strong chemical bonds with the fiber molecules, resulting in bright and long-lasting hues. This makes Reactive Red 2 a popular choice for dyeing fabrics used in clothing, home textiles, and upholstery. The dye's resistance to washing and light ensures that the colors remain vibrant and stable over time.

In addition to its textile applications, Reactive Red 2 is used in the paper industry. It is employed to impart color to paper products, including specialty papers and packaging materials. The dye’s ability to adhere to paper fibers contributes to the production of colorful and aesthetically appealing paper goods.

The dye also has applications in the field of molecular biology. Reactive Red 2 is used as a staining agent in various laboratory techniques, including gel electrophoresis and microscopy. Its staining properties facilitate the visualization of biomolecules, such as proteins and nucleic acids, allowing researchers to analyze and interpret experimental results more effectively.

Despite its utility, the use of Reactive Red 2 is subject to environmental and safety considerations. As with many synthetic dyes, there are concerns regarding its potential impact on the environment and human health. Efforts are ongoing to develop safer and more sustainable alternatives while ensuring the continued effectiveness of dyeing processes.

References

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