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Tropaeolin O

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Identification
Molecular formula
C16H13N2O4S
CAS number
633-96-5
IUPAC name
6-hydroxy-5-(p-tolylazo)naphthalene-2-sulfonic acid
State
State

This compound is typically a solid at room temperature. It is usually in the form of a powder or crystallized solid, characteristic of many azo dyes.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.00
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
350.35g/mol
Molar mass
350.3850g/mol
Density
0.9800g/cm3
Appearence

Appearance: Tropaeolin O (also known as Orange II) is typically found as an orange to reddish-orange powder or crystalline solid. This compound is commonly used as a dye and exhibits a bright coloration, making it visually recognizable.

Comment on solubility

Solubility of 6-hydroxy-5-(p-tolylazo)naphthalene-2-sulfonic acid

The solubility of 6-hydroxy-5-(p-tolylazo)naphthalene-2-sulfonic acid, a sulfonated aromatic compound, can be quite intriguing due to its unique structure and functional groups. Here are some key points regarding its solubility characteristics:

  • Water Solubility: This compound is generally considered to be soluble in water, primarily due to the presence of the sulfonic acid group, which can ionize and interact favorably with water
  • Solvent Compatibility: It may also exhibit solubility in various polar organic solvents, although the degree of solubility can vary depending on the solvent's polarity
  • Temperature Influence: Like many organic compounds, its solubility may increase with temperature. Thus, higher temperatures may facilitate better dissolution in aqueous solutions.
  • pH Sensitivity: The solubility can be affected by the pH of the solution, with a more acidic environment potentially enhancing solubility due to increased ionization of the sulfonic acid group.
  • Practical Applications: The solubility properties of this compound make it useful in various analytical applications, including dye and indicator formulations in chemistry.

In summary, understanding the solubility of 6-hydroxy-5-(p-tolylazo)naphthalene-2-sulfonic acid not only highlights its chemical behavior but also enhances its utility in multiple scientific fields. The interplay between its functional groups and solvent environments provides a rich area for exploration and application.

Interesting facts

6-Hydroxy-5-(p-tolylazo)naphthalene-2-sulfonic acid: An Overview

6-hydroxy-5-(p-tolylazo)naphthalene-2-sulfonic acid, often known for its vibrant coloration, is an important compound in the field of analytical chemistry and dye manufacturing. This compound serves as a notable example of an azo dye, characterized by the presence of the azo group (−N=N−), which imparts unique properties essential for various applications.

Applications

Some key applications of this compound include:

  • Dyeing Agent: Frequently used in the dyeing of textiles due to its bright color and stability.
  • pH Indicator: Functions effectively as a pH indicator in titration experiments, providing clear visual cues with color changes.
  • Analytical Chemistry: Employed in complexometric titrations and various other analytical techniques due to its ability to form complexes with metal ions.

Chemical Properties

This compound displays a remarkable solubility in water, making it suitable for various aqueous applications. Its structure allows it to exist in several tautomeric forms, which can influence its reactivity and interaction with other substances. Interestingly, the sulfonic acid group contributes to the compound's enhanced water solubility compared to non-sulfonated azo dyes.

Significance in Research

Due to its structural complexity, 6-hydroxy-5-(p-tolylazo)naphthalene-2-sulfonic acid is often utilized in research for:

  • Studying Dye Stability: Researchers analyze how this compound withstands environmental factors such as light and temperature.
  • Developing New Dyes: Its unique properties pave the way for the synthesis of novel dyes with enhanced performance in terms of colorfastness and toxicity reduction.

As a compound with both historical significance and modern applications, 6-hydroxy-5-(p-tolylazo)naphthalene-2-sulfonic acid showcases the intricate interplay of chemistry and practical use, making it a subject of interest for both students and seasoned chemists alike.

Synonyms
6283-28-9
NSC7814
NSC-7814
NCIStruc1_001092
NCIStruc2_000754
SCHEMBL1096315
CHEMBL1554854
CHEMBL2008374
SCHEMBL15598887
DTXSID10422532
NCI7814
CCG-36887
NCGC00013087
NCGC00013087-02
NCGC00096210-01
NCI60_020379
NCI60_041724
6-hydroxy-5-((4-methylphenyl)diazenyl)-2-naphthalenesulfonic acid