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Methyl Red

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Identification
Molecular formula
C15H15N3O2
CAS number
493-52-7
IUPAC name
4-[4-(dimethylamino)phenyl]azo-2-methyl-phenol
State
State

At room temperature, Methyl Red is a solid. It is typically found as a crystalline powder and is not readily soluble in water, but soluble in ethanol and other organic solvents.

Melting point (Celsius)
179.00
Melting point (Kelvin)
452.15
Boiling point (Celsius)
525.50
Boiling point (Kelvin)
798.70
General information
Molecular weight
269.30g/mol
Molar mass
269.3010g/mol
Density
1.2850g/cm3
Appearence

Methyl Red is a dark red crystalline powder that exhibits a distinct red to yellow color change in solution. It is generally used as a pH indicator and is known for its bright and intense coloration.

Comment on solubility

Solubility of 4-[4-(dimethylamino)phenyl]azo-2-methyl-phenol

The solubility of 4-[4-(dimethylamino)phenyl]azo-2-methyl-phenol, often referred to as a synthetic dye intermediate, presents interesting characteristics due to its molecular structure.

This compound exhibits the following solubility traits:

  • Solvent Dependency: It is typically more soluble in organic solvents such as ethanol and acetone than in water. This can be attributed to nonpolar regions in the molecule that interact favorably with organic media.
  • Hydrophobic Interactions: The presence of hydrophobic aromatic rings promotes interactions with nonpolar solvents, while the polar dimethylamino group can create some solubility in polar solvents, although limited.
  • pH Sensitivity: The solubility can be affected by pH changes; under acidic conditions, protonation of the dimethylamino group can enhance solubility in water.

It is notable that the dye's solubility influences its application in various industries, particularly in textiles and polymers, where achieving adequate solubility ensures optimal coloration effects.

In conclusion, the compound’s solubility is defined by a balance of hydrophilic and hydrophobic characteristics, as well as environmental factors such as pH and solvent choice. Keeping these aspects in mind can greatly aid in optimizing its use in different chemical processes.

Interesting facts

Interesting Facts about 4-[4-(dimethylamino)phenyl]azo-2-methyl-phenol

4-[4-(dimethylamino)phenyl]azo-2-methyl-phenol, commonly referred to as a type of azo dye, is a fascinating compound with a range of applications and characteristics that make it quite interesting:

  • Azobenzenes and Color: Azo compounds are known for their vibrant colors, which are a result of the azo group (–N=N–). These colors make them exceptionally valuable in the textile industry for dyeing fabrics.
  • Applications in Industry: Beyond textiles, this compound finds use in the production of inks, plastics, and paper. It can also serve as a dye in food and cosmetics, illustrating its versatility.
  • Environmental and Health Considerations: Azo dyes can sometimes release aromatic amines, which are potential carcinogens. There's a growing interest in studying the breakdown of these compounds in the environment to mitigate any health risks.
  • Research Applications: In molecular biology, certain azo compounds are employed as indicators or reagents due to their ability to undergo reversible reactions, making them useful in various biochemical assays.
  • Historical Context: Azo dyes were first developed in the 19th century, marking a significant advancement in synthetic dye technology. Their historical importance highlights the evolution of organic chemistry and its applications.

This compound represents a blend of aesthetic beauty through color and practical utility in modern applications. As researchers continue to explore its properties, the potential for new uses in technology and industry remains promising.

Synonyms
4-((p-(Dimethylamino)phenyl)azo)-o-cresol
15330-37-7
BRN 1821442
o-CRESOL, 4-((p-(DIMETHYLAMINO)PHENYL)AZO)-
4-16-00-00500 (Beilstein Handbook Reference)