6535-42-8

Basic information

• Product Name: Solvent Red 3
• Synonyms: 4-[(4-ethoxyphenyl)azo]-1-naphthaleno;c.i.solventred3;CI 12010;FAT BROWN B;4-((4-ethoxyphenyl)azo)-1-naphthalenol;4-[(4-Ethoxyphenyl)azo]naphthol;SOLVENT RED 3;4-(4-ethoxyphenyl)azo-1-naphthol
• CAS NO: 6535-42-8
• Molecular Formula: C₁₈H₁₆N₂O₂
• Molecular Weight: 292.33
• EINECS: 229-439-8
• Product Categories: Organics;Solvent Dyestuff
• Mol File: 6535-42-8.mol
• Article Data: 0

Chemical Properties

• Boiling Point: 510.516 °C at 760 mmHg
• Flash Point: 262.458 °C
• Appearance: /
• Density: 1.173 g/cm³
• Vapor Pressure: 0mmHg at 25°C
• Refractive Index: 1.607
• Storage Temp.: room temp
• PKA: 8.39±0.40(Predicted)
• CAS DataBase Reference: Solvent Red 3(CAS DataBase Reference)
• NIST Chemistry Reference: Solvent Red 3(6535-42-8)
• EPA Substance Registry System: Solvent Red 3(6535-42-8)

Safety Data

• WGK Germany: 3
• Hazardous Substances Data: 6535-42-8(Hazardous Substances Data)

Usage

Description

Solvent Red 3, also known as Fat Brown B, is a synthetic dye with the chemical formula C28H22N4Na2O9S2. It is a dark yellow crystalline compound with a melting point of 168°C. Solvent Red 3 is characterized by its solubility in organic solvents such as ethanol, acetone, and benzene. It exhibits light fastness and heat resistance, making it suitable for various applications.

Uses

Used in Dye Industry:
Solvent Red 3 is used as a dye for coloring various materials, including textiles, plastics, and leather. Its ability to impart a deep, rich color makes it a popular choice in the dye industry.
Used in Staining Applications:
In addition to its use as a dye, Solvent Red 3 is also employed as a stain for biological samples. Its affinity for certain cellular components allows for the visualization and differentiation of various structures under a microscope.
Used in Analytical Chemistry:
Solvent Red 3 is utilized as an indicator in analytical chemistry, particularly in titrations involving the determination of certain metal ions. Its color change properties make it a useful tool for detecting the endpoint of a reaction.
Used in Cosmetics Industry:
Due to its vibrant color and stability, Solvent Red 3 is also used in the cosmetics industry for coloring products such as lipsticks, blushes, and eyeshadows.
Properties and Applications:
The properties of Solvent Red 3, such as its light fastness and heat resistance, make it suitable for various applications. It is stable under ISO standards, with a melting point range of 146-149°C. However, it exhibits poor to general light fastness and is insoluble in water. When exposed to sodium carbonate (5%) and hydrochloric acid (5%), Solvent Red 3 shows no significant change in its properties.

Preparation

4-Ethoxybenzenamine diazotization, and Naphthalen-1-ol coupling.

Standard

Light Fastness

Melting point

Stable

InChI:InChI=1/C18H16N2O2/c1-2-22-14-9-7-13(8-10-14)19-20-17-11-12-18(21)16-6-4-3-5-15(16)17/h3-12,19H,2H2,1H3/b20-17+

Upstream product

• 156-43-4 4-Ethoxyaniline