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Orange II

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Identification
Molecular formula
C16H11N2O4S
CAS number
633-96-5
IUPAC name
4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonic acid
State
State

At room temperature, Orange II is typically found in a solid state, specifically as a powder used in various dye applications.

Melting point (Celsius)
190.00
Melting point (Kelvin)
463.15
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
350.32g/mol
Molar mass
350.3200g/mol
Density
1.4950g/cm3
Appearence

Orange II appears as an orange to reddish-brown powder. It is commonly used in dyeing textiles, paper, and as a pH indicator.

Comment on solubility

Solubility of 4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonic acid

4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonic acid is a fascinating compound with notable solubility characteristics. Being an aromatic sulfonic acid, its solubility can be influenced by several factors:

  • Polarity: The presence of the sulfonic acid functional group (-SO3H) enhances its polar nature, facilitating its dissolution in polar solvents such as water.
  • Hydrogen Bonding: The hydroxy group (-OH) contributes to hydrogen bonding, which further increases solubility in aqueous solutions as it can interact favorably with water molecules.
  • pH Dependence: In acidic solutions, this compound remains protonated, which can affect its overall solubility. In alkaline conditions, deprotonation can lead to increased solubility due to the formation of more soluble anionic species.
  • Temperature Influence: Like many other compounds, the solubility of 4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonic acid typically increases with temperature, making hotter solvents more effective for dissolution.

In summary, the solubility of 4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonic acid is predominantly enhanced by its polar characteristics and the ability to form hydrogen bonds. Understanding these properties is crucial for applications in various fields, including dye chemistry and analytical chemistry.

Interesting facts

Interesting Facts about 4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonic acid

4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonic acid, commonly known as a azo dye, belongs to a class of compounds that have numerous applications in various fields. Here are some intriguing aspects of this compound:

  • Origins and Structure: This compound features a distinctive azo group (−N=N−), which is responsible for its vivid coloration. The presence of a naphthyl group enhances its resonance stability, making it a notable candidate in dye chemistry.
  • Applications: Primarily, this compound is used in the textile industry as a dye. Its vibrant colors can impart a rich hue to fabrics, making it desirable for various materials. Additionally, it serves important roles in:
    • Pharmaceutical formulations
    • Food coloring
    • Biological staining techniques
  • Environmental Considerations: While azo dyes are celebrated for their color properties, there are growing concerns regarding their environmental impact and safety. Certain azo compounds can be converted into carcinogenic amines under specific conditions, leading to ongoing research into safer alternatives.
  • Historical Significance: The synthesis of azo compounds marked a key moment in the development of synthetic dyes in the 19th century, revolutionizing the textile industry. This compound, along with others, paved the way for the creation of a wide range of colors and shades in consumer products.
  • Research Potential: Ongoing studies are delving into novel applications of azo dyes in fields like nanotechnology and photonic devices, where their light-absorbing properties can be harnessed to create advanced materials.

In conclusion, 4-[(4-hydroxy-1-naphthyl)azo]benzenesulfonic acid stands as a fascinating example of how chemistry intertwines with industry and environment. Its vivid colors and potential for various uses reflect the complexity and utility of azo compounds.

Synonyms
Benzenesulfonic acid, 4-(2-(4-hydroxy-1-naphthalenyl)diazenyl)-
Benzenesulfonic acid, 4-[2-(4-hydroxy-1-naphthalenyl)diazenyl]-
611-544-9
574-69-6
Acid Orange 20 free acid
J63QP1Z3JT
Naphthol orange
Tropaeolin 1
Benzenesulfonic acid, 4-((4-hydroxy-1-naphthalenyl)azo)-
Benzenesulfonic acid, 4-[(4-hydroxy-1-naphthalenyl)azo]-
Orange S
Aizen Orange I
Orange IM
a-Naphthol orange
Acid Orange I
Eniacid Orange I
Java Orange I
Acid phosphine CL
Certiqual Orange I
Hispacid Orange 1
Neklacid Orange 1
Tertracid Orange I
FDC Orange I
Elgacid Orange 2G
Naphthalene Orange I
Dye Orange No. 1
Tropeolin 000-1
Nankai Acid Orange I
Orange 1 sodium salt
Acid Leather Orange I
1333 Orange
Orange I, Sodium Salt
Tropaeolin OOO no. 1
Aizen Naphthol Orange I
A.F. Orange No. 1
F. D. C Orange 1
Aizen Food Orange No. 1
D & C Orange No. 3
FD And C Orange No. 1
4-[(E)-(4-Hydroxynaphthalen-1-Yl)diazenyl]benzenesulfonic Acid
Orange I Extra Conc. A Export
External D and C Orange No. 3
C.I. Acid Orange 20, monosodium salt
C.I. 14600
4-(p-Sulfophenylazo)-1-naphthol, sodium salt
4-p-Sulfophenylazo-1-naphthol monosodium salt
4-(p-Sulfophenylazo)-1-naphthol, monosodium salt
Tropaeolin 000
4-(4-HYDROXY-1-NAPHTHYLAZO)BENZENESULFONIC ACID
alpha -naphthol orange
UNII-J63QP1Z3JT
SCHEMBL2203510
DTXSID5060356
PURJGKXXWJKIQR-UHFFFAOYSA-N
4-(4-Sulfophenylazo)-1-naphthol
1-(4'-sulfophenylazo)-4-naphthol
C.I. Acid Orange 20, free acid
ACID ORANGE 20 (FREE ACID)
Sodium azo-alpha -naphtholsulfanilate
AKOS024340971
C.I. ACID ORANGE 20 (FREE ACID)
NS00033728
benzenesulfonic acid, 4-(4-hydroxynaphth-1-ylazo)-
Q27464182
4-[(4-Hydroxy-1-naphthalenyl)azo]benzenesulfonic acid, 9CI
BENZENESULFONIC ACID, 4-(2-(4-HYDROXY-1-NAPHTHALENYL)
ORI