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Orange G

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Identification
Molecular formula
C16H12N2O7S2Na2
CAS number
1936-15-8
IUPAC name
4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid
State
State

At room temperature, Orange G is typically in a solid state, appearing as a bright orange powder.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.15
Boiling point (Celsius)
800.00
Boiling point (Kelvin)
1 073.15
General information
Molecular weight
452.37g/mol
Molar mass
452.3700g/mol
Density
1.3096g/cm3
Appearence

Orange G appears as an orange powder or granules. It is commonly used as a dye and is bright orange in color.

Comment on solubility

Solubility of 4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid

The solubility of 4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid, commonly referred to as an azo compound, is an interesting topic due to its characteristic functional groups influencing its aqueous properties. To better understand its solubility, consider the following aspects:

  • Polar Functional Groups: The presence of the sulfonic acid group (-SO₃H) greatly enhances the compound's solubility in water. This highly polar group can interact favorably with water molecules, promoting dissolution.
  • Hydrogen Bonding: The -OH (hydroxyl) group also contributes to solubility by allowing for hydrogen bonding with water, further assisting in overcoming intermolecular forces within the solid state of the compound.
  • Hydrophobic Interactions: However, the naphthalene rings present a hydrophobic character, which may limit solubility in pure water. The balance between these hydrophilic (water-attracting) and hydrophobic (water-repelling) properties is crucial in determining overall solubility.

In practical terms, while this compound exhibits significant solubility in polar solvents due to its ionic and polar groups, its exact solubility can be influenced by temperature and pH of the solution. Therefore, studies on solubility might reveal that:

  • In acidic conditions, the sulfonic acid protonates and potentially enhances solubility.
  • At neutral to basic pH levels, the ionized form can be favored, still promoting solubility.

In conclusion, while 4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid is generally soluble in polar environments, the solubility dynamics are finely tuned by the interplay of its functional groups and the external conditions. Exploring its solubility opens doors to understanding its behavior in various chemical processes.

Interesting facts

Exploring 4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid

The compound 4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid, often referred to as a member of the azo dye family, has a rich history and diverse applications that make it particularly fascinating.

Chemical Significance

Here are some notable characteristics of this compound:

  • Azo Dyes: This compound belongs to a class of dyes known for the vibrant colors they produce. Azo dyes are characterized by the presence of one or more azo groups (-N=N-), which account for their strikingly vivid appearances.
  • Chromophore Structure: The addition of naphthalene units enhances stability and gives this compound its unique properties and color. The conjugated system formed by the multiple aromatic rings allows for extended delocalization of electrons, contributing to its color.
  • pH Indicator: Due to its sulfonic acid group, this compound can exhibit different absorption characteristics depending on the pH of the solution, making it useful as an acid-base indicator.

Applications in Various Fields

4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid is widely used in several applications:

  • Textile Industry: Its ability to impart bright colors makes it a valuable dye for fabrics and papers.
  • Biological Research: The compound can be used in various biochemical assays, particularly in studies involving enzyme activity and in the visualization of proteins.
  • Environmental Monitoring: Its properties allow it to be employed in tests for pollutants in water sources, helping to assess environmental impact.

Quote from the Field

As one prominent chemist stated, "The beauty of azo dyes lies not only in their color but also in their versatile applications that stretch across different scientific domains." This compound exemplifies that statement, showcasing how chemistry bridges aesthetic beauty and practical utility.

In summary, 4-[(2-hydroxy-1-naphthyl)azo]naphthalene-1-sulfonic acid is more than just a chemical formula; it represents a fascinating intersection of art, science, and technology that continues to inspire research and innovation in the chemical sciences.

Synonyms
4-((2-Hydroxy-1-naphthyl)azo)naphthalenesulphonic acid
EINECS 242-148-0
4-[(2-hydroxy-1-naphthyl)azo]naphthalenesulphonic acid
1-Naphthalenesulfonic acid, 4-((2-hydroxy-1-naphthalenyl)azo)-
1-Naphthalenesulfonic acid, 4-(2-(2-hydroxy-1-naphthalenyl)diazenyl)-
1-Naphthalenesulfonic acid, 4-[(2-hydroxy-1-naphthalenyl)azo]-
1-Naphthalenesulfonic acid, 4-[2-(2-hydroxy-1-naphthalenyl)diazenyl]-
242-148-0
18268-54-7
4-[(2-hydroxynaphthalen-1-yl)diazenyl]naphthalene-1-sulfonic acid
4-[(E)-(2-Hydroxynaphthalen-1-Yl)diazenyl]naphthalene-1-Sulfonic Acid
Acid Red 88 parent
CHEMBL122275
SCHEMBL5701120
DTXSID2047010
SCHEMBL16490257
SCHEMBL19322466
DTXSID70859668
JSAKRLDIZOGQTN-UHFFFAOYSA-N
NS00051956
Q27465005
RE8