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Pigment Red 3

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Identification
Molecular formula
C17H12N2O3
CAS number
134-32-7
IUPAC name
1-hydroxy-4-(o-tolylazo)naphthalene-2-carboxylic acid
State
State

At room temperature, Pigment Red 3 is a solid. It is stable and maintains its structure and appearance under standard conditions.

Melting point (Celsius)
316.00
Melting point (Kelvin)
589.00
Boiling point (Celsius)
650.00
Boiling point (Kelvin)
923.00
General information
Molecular weight
292.31g/mol
Molar mass
292.3140g/mol
Density
1.3300g/cm3
Appearence

This compound is typically an orange to red crystalline powder. It is often used as a dye or pigment, displaying vibrant color properties when applied in various contexts.

Comment on solubility

Solubility of 1-hydroxy-4-(o-tolylazo)naphthalene-2-carboxylic acid

The solubility of the compound 1-hydroxy-4-(o-tolylazo)naphthalene-2-carboxylic acid (C14H11N3O3) is influenced by various factors, primarily its structural characteristics and the surrounding solvent environment.

Key Factors Affecting Solubility:

  • Polarity: The presence of hydroxyl and carboxylic acid functional groups enhances the compound's ability to interact with polar solvents such as water.
  • Hydrogen Bonding: These functional groups can form hydrogen bonds, thereby increasing solubility in polar solvents.
  • Molecular Structure: The bulky o-tolylazo substituent may restrict solubility in certain nonpolar solvents due to steric hindrance.
  • pH Sensitivity: The solubility can vary with pH; in basic conditions, deprotonation of the carboxylic acid can enhance solubility.

In practical terms, this compound may show moderate solubility in organic solvents and varying solubility in aqueous solutions depending on the concentration and ionic strength of the solvent. Experimental data indicate that solubility can be optimized by adjusting conditions such as temperature and pH. Hence, one may conclude that 1-hydroxy-4-(o-tolylazo)naphthalene-2-carboxylic acid exhibits a complex solubility profile shaped by its unique chemical structure and the nature of the solvent.

Interesting facts

1-Hydroxy-4-(o-tolylazo)naphthalene-2-carboxylic Acid

1-Hydroxy-4-(o-tolylazo)naphthalene-2-carboxylic acid, often referred to in laboratory settings as an azo compound, is a captivating substance in the realm of organic chemistry. This compound features a complex structure with several functional groups that contribute to its unique properties. Here are some interesting facts:

  • Versatile Applications: Due to its azo group, this compound is often employed in the synthesis of dyes and pigments. Azo compounds are renowned for their brilliant colors, making this compound valuable in the dye industry.
  • Biological Significance: Research has shown that various azo compounds exhibit antibacterial properties. This opens doors for potential applications in pharmaceuticals and biochemistry.
  • Colorimetric Analysis: The compound's structure allows it to be utilized in colorimetric analysis for detecting certain analytes due to its ability to exhibit distinct color changes under specific conditions.

As a student or a scientist dealing with this compound, it's essential to recognize the implications of the azo functionality. Consider the quote:

"Azo compounds are not just a source of colors; they represent a fundamental class of compounds that bridge chemistry and application." – Unknown

Furthermore, understanding the reactivity of the hydroxyl and carboxylic acid groups in this compound can lead to various synthetic routes for creating new derivatives, showcasing the compound's utility in interdisciplinary chemistry. Overall, 1-hydroxy-4-(o-tolylazo)naphthalene-2-carboxylic acid serves not only as a chemical of interest but also as a reminder of the endless possibilities within organic synthesis.

Synonyms
26233-08-9
BRN 0927424
2-NAPHTHOIC ACID, 1-HYDROXY-4-(o-TOLYLAZO)-
1-Hydroxy-4-(o-tolyldiazeno)-2-naphthoic acid
2-Naphthalenecarboxylic acid, 1-hydroxy-4-((2-methylphenyl)azo)-
1-Hydroxy-4-(2-methylphenylazo)-2-naphthoic acid
2-Naphthoic acid, 1-hydroxy-4-(2-methylphenylazo)-