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Reactive Black 5

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Identification
Molecular formula
C26H21N5Na3O19S6
CAS number
17095-24-8
IUPAC name
trisodium;6-(2,4-diaminophenyl)azo-3-[4-[4-[[7-(2,4-diaminophenyl)azo-1-hydroxy-3-sulfonato-2-naphthyl]azo]-2-sulfonato-anilino]phenyl]azo-4-hydroxy-naphthalene-2-sulfonate
State
State

Reactive Black 5 is typically in a solid state at room temperature.

Melting point (Celsius)
300.00
Melting point (Kelvin)
573.15
Boiling point (Celsius)
350.00
Boiling point (Kelvin)
623.15
General information
Molecular weight
991.82g/mol
Molar mass
991.8200g/mol
Density
1.3500g/cm3
Appearence

Reactive Black 5 is typically supplied as a fine, dark blue-black powder. It has the appearance of a black crystalline solid and is used extensively in textile dyeing and printing.

Comment on solubility

Solubility of Trisodium 6-(2,4-diaminophenyl)azo-3-[4-[4-[[7-(2,4-diaminophenyl)azo-1-hydroxy-3-sulfonato-2-naphthyl]azo]-2-sulfonato-anilino]phenyl]azo-4-hydroxy-naphthalene-2-sulfonate

The solubility characteristics of this compound are quite significant due to its complex molecular structure and the presence of multiple sulfonate groups. Here are some key points regarding its solubility:

  • Water Solubility: This compound is typically quite soluble in water, thanks to its numerous ionic sulfonate (-SO₃Na) groups which enhance its hydrophilicity.
  • pH Dependence: The solubility may vary with pH levels; it is generally more soluble in acidic to neutral pH ranges.
  • Temperature Effects: Like many compounds, its solubility can increase with temperature, making it more effective in higher temperature applications.

As a result of these factors, one can generally expect it to be substantially soluble in aqueous environments, making it suitable for various applications in both biological and chemical systems. It's important to note that solubility can be influenced by the presence of other ions in a solution, which can either enhance or inhibit its dissolving capabilities.


In summary, "the more sulfonate groups, the greater the water solubility." This principle underlies the ability of this compound to remain soluble, thus enhancing its functionality in various applications.

Interesting facts

Trisodium 6-(2,4-diaminophenyl)azo-3-[4-[4-[[7-(2,4-diaminophenyl)azo-1-hydroxy-3-sulfonato-2-naphthyl]azo]-2-sulfonato-anilino]phenyl]azo-4-hydroxy-naphthalene-2-sulfonate

This compound, often referred to in scientific contexts for its extensive applications, showcases the intricacies and beauty of azo dyes.

Interesting Facts

  • Azo Dyes: As a member of the azo dye family, this compound contains the characteristic -N=N- group, which imparts vivid coloring effects, making it invaluable in various industries.
  • Applications: It finds use in textiles, food, and cosmetics due to its bright color. Azo dyes can create vibrant hues that are appealing and often used in coloring agents.
  • Biological Significance: Recent studies have explored the potential of azo dyes in biological applications, such as drug delivery systems, where their dye properties can be utilized for targeting therapeutic agents.
  • Color Stability: Despite their vibrant colors, the stability of azo dyes can vary. Scientists often examine the chemical structure to ensure durability in products.
  • Sustainability Concerns: Just as with many synthetic dyes, there are environmental considerations linked to azo compounds, prompting ongoing research into eco-friendly alternatives and degradation methods.

In summary, trisodium 6-(2,4-diaminophenyl)azo-3-[4-[4-[[7-(2,4-diaminophenyl)azo-1-hydroxy-3-sulfonato-2-naphthyl]azo]-2-sulfonato-anilino]phenyl]azo-4-hydroxy-naphthalene-2-sulfonate not only represents a fascinating chemical entity but also serves as a reminder of the balance between innovation in chemistry and the need for sustainable practices.

Synonyms
Direct black 22
2-Naphthalenesulfonic acid, 6-((2,4-diaminophenyl)azo)-3-((4-((4-((7-((2,4-diaminophenyl)azo)-1-hydroxy-3-sulfo-2-naphthalenyl)azo)phenyl)amino)-3-sulfophenyl)azo)-4-hydroxy-, trisodium salt
Trisodium 6-((2,4-diaminophenyl)azo)-3-((4-((4-((7-((2,4-diaminophenyl)azo)-1-hydroxy-3-sulphonato-2-naphthyl)azo)phenyl)amino)-3-sulphonatophenyl)azo)-4-hydroxynaphthalene-2-sulphonate
2-Naphthalenesulfonic acid, 6-((2,4-diaminophenyl)azo)-3-((4-((4-((7-((2,4-diaminophenyl)azo)-1-hydroxy-3-sulfo-2-naphthalenyl)azo)phenyl)amino)-3-sulfophenyl)azo)-4-hydroxy-, sodium salt
2-Naphthalenesulfonic acid, 6-(2-(2,4-diaminophenyl)diazenyl)-3-(2-(4-((4-(2-(7-(2-(2,4-diaminophenyl)diazenyl)-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl)phenyl)amino)-3-sulfophenyl)diazenyl)-4-hydroxy-, sodium salt (1:3)
2-Naphthalenesulfonic acid, 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]phenyl]amino]-3-sulfophenyl]azo]-4-hydroxy-, trisodium salt
2-Naphthalenesulfonic acid, 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulfo-2-naphthalenyl]azo]phenyl]amino]-3-sulfophenyl]azo]-4-hydroxy-, sodium salt
2-Naphthalenesulfonic acid, 6-[2-(2,4-diaminophenyl)diazenyl]-3-[2-[4-[[4-[2-[7-[2-(2,4-diaminophenyl)diazenyl]-1-hydroxy-3-sulfo-2-naphthalenyl]diazenyl]phenyl]amino]-3-sulfophenyl]diazenyl]-4-hydroxy-, sodium salt (1:3)
Trisodium 6-[(2,4-diaminophenyl)azo]-3-[[4-[[4-[[7-[(2,4-diaminophenyl)azo]-1-hydroxy-3-sulphonato-2-naphthyl]azo]phenyl]amino]-3-sulphonatophenyl]azo]-4-hydroxynaphthalene-2-sulphonate
11136-49-5
2-Naphthalenesulfonic acid, 6-(2,4-diaminophenyl)azo-3-4-4-7-(2,4-diaminophenyl)azo-1-hydroxy-3-sulfo-2-naphthalenylazophenylamino-3-sulfophenylazo-4-hydroxy-, trisodium salt
229-326-3
814-873-8
841-303-5
881844-06-0
6473-13-8
C.I. DIRECT BLACK 22
trisodium;6-[(2,4-diaminophenyl)diazenyl]-3-[[4-[4-[[7-[(2,4-diaminophenyl)diazenyl]-1-hydroxy-3-sulfonatonaphthalen-2-yl]diazenyl]-2-sulfonatoanilino]phenyl]diazenyl]-4-hydroxynaphthalene-2-sulfonate
Sodium 6-((2,4-diaminophenyl)diazenyl)-3-((4-((4-((7-((2,4-diaminophenyl)diazenyl)-1-hydroxy-3-sulfonatonaphthalen-2-yl)diazenyl)-2-sulfonatophenyl)amino)phenyl)diazenyl)-4-hydroxynaphthalene-2-sulfonate
CCRIS 1390
EINECS 229-326-3
Direct Black 22, tech.
DTXSID7027629
EINECS 280-246-5
MFCD00078136
C.I. Direct Black 22, sodium salt
AKOS025310834
FD41144
trisodium,(3Z)-6-[(2,4-diaminophenyl)diazenyl]-3-[[4-[4-[(2Z)-2-[7-[(2,4-diaminophenyl)diazenyl]-1-oxo-3-sulfonatonaphthalen-2-ylidene]hydrazinyl]-2-sulfonatoanilino]phenyl]hydrazinylidene]-4-oxonaphthalene-2-sulfonate
C.I. 35435
trisodium 6-[(E)-(2,4-diaminophenyl)diazenyl]-3-{(E)-[4-({4-[(E)-{7-[(E)-(2,4-diaminophenyl)diazenyl]-1-hydroxy-3-sulfonato-2-naphthyl}diazenyl]phenyl}amino)-3-sulfonatophenyl]diazenyl}-4-hydroxynaphthalene-2-sulfonate