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Azo dye (Orange II)

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Identification
Molecular formula
C16H12N2O5S
CAS number
633-96-5
IUPAC name
3-[(1,5-dihydroxy-2-naphthyl)azo]-4-hydroxy-benzenesulfonic acid
State
State

Orange II is a solid at room temperature. It is stable under normal conditions.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.15
Boiling point (Celsius)
400.00
Boiling point (Kelvin)
673.15
General information
Molecular weight
350.34g/mol
Molar mass
350.3400g/mol
Density
1.5200g/cm3
Appearence

Orange II is a bright orange-red solid. It is known for its vivid hue, which is largely used in dyeing processes.

Comment on solubility

Solubility of 3-[(1,5-dihydroxy-2-naphthyl)azo]-4-hydroxy-benzenesulfonic acid

The solubility of 3-[(1,5-dihydroxy-2-naphthyl)azo]-4-hydroxy-benzenesulfonic acid is influenced by several factors due to its complex structure. Being a sulfonic acid derivative, it exhibits certain characteristics that affect its solubility in various solvents.

Characteristics of Solubility:

  • Water Solubility: This compound is generally soluble in water due to the presence of the sulfonic acid group, which is polar and can interact favorably with water molecules.
  • Organic Solvents: The solubility in organic solvents may vary. It is often less soluble in non-polar solvents, as the hydrophobic naphthyl component counters the hydrophilic sulfonic group.
  • Influence of pH: The solubility can be affected by the acidity or basicity of the environment. In more acidic conditions, increased solubility might occur due to protonation effects.

It is essential to consider the **temperature** and **ionic strength** of the solvent when evaluating solubility. As a rule of thumb, the more polar the environment, the higher the solubility for this compound. As noted, "solubility is a key driver in the compound's application potential," thus understanding this aspect opens avenues for research and development in various fields.


Interesting facts

Interesting Facts About 3-[(1,5-dihydroxy-2-naphthyl)azo]-4-hydroxy-benzenesulfonic acid

This compound is known for its vibrant color and unique applications in various fields. Here are some intriguing aspects:

  • Azo Dyes: The presence of an azo group in this compound makes it a member of the azo dyes family, which are widely used in the textile and cosmetic industries due to their bright hues and excellent color fastness.
  • Biological Significance: Compounds like this one have been researched for their potential as indicators or as agents in biological assays, signaling their relevance in biochemical studies.
  • Environmental Impact: As with many azo dyes, there is ongoing research into the environmental implications of their use, especially regarding their biodegradability and the potential toxicity of degradation products.
  • Color Chemistry: The color properties of this compound can be influenced by pH levels, making it an interesting subject for studies in acid-base chemistry and its applications in pH indicators.
  • Synthetic Pathways: The synthesis of such complex compounds often showcases a variety of organic chemistry techniques, ranging from diazotization to sulfonation, allowing students to appreciate the intricacies of synthetic organic chemistry.

In the words of a renowned chemist, "The beauty of chemistry lies in its ability to transform simple molecules into complex structures, unlocking their potential for innovation." This compound exemplifies this concept, serving as a bridge between theoretical chemistry and practical applications.

Synonyms
3-((1,5-Dihydroxy-2-naphthyl)azo)-4-hydroxybenzenesulphonic acid
EINECS 247-236-2
Benzenesulfonic acid, 3-((1,5-dihydroxy-2-naphthalenyl)azo)-4-hydroxy-
Benzenesulfonic acid, 3-[(1,5-dihydroxy-2-naphthalenyl)azo]-4-hydroxy-
3-[(1,5-dihydroxy-2-naphthyl)azo]-4-hydroxybenzenesulphonic acid
247-236-2
2052-25-7
Acid mordant black 9
25747-07-3
Na 3-(1,5-DiOH-2-naphthyl)azo-4-OHbenzenesulphonate
SCHEMBL11754975
DTXSID40948619
DTXSID80862820
BNBSEAFANQAPGO-UHFFFAOYSA-N
HETKNRGJVSOOEF-UHFFFAOYSA-N
3-[(1,5-Dihydroxy-2-naphthyl)azo]-4-hydroxybenzenesulfonic acid
NS00007211
3-[(1,5-Dihydroxynaphthalen-2-yl)diazenyl]-4-hydroxybenzene-1-sulfonic acid
3-[2-(1,5-Dioxo-1,5-dihydronaphthalen-2-yl)hydrazinyl]-4-hydroxybenzene-1-sulfonic acid