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Congo red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;4-amino-3-[4-[4-[(1-amino-4-sulfonato-2-naphthyl)azo]phenyl]phenyl]azo-naphthalene-1-sulfonate
State
State

At room temperature, Congo red is typically in a solid state, available as fine powder or crystals. It is commonly used in laboratories and textiles for its dye properties.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
-1.00
Boiling point (Kelvin)
-1.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
1.0000g/cm3
Appearence

Congo red appears as a red-brown granular powder or dark red crystals. It is known for its strong coloring properties and is often used as a dye in various applications. When dissolved in water, it produces a red to blue color depending on the pH level of the solution, making it a useful pH indicator.

Comment on solubility

Solubility of Disodium 4-Amino-3-[4-[4-[(1-Amino-4-Sulfonato-2-Naphthyl)Azo]Phenyl]Phenyl]Azo-Naphthalene-1-Sulfonate

The solubility of disodium 4-amino-3-[4-[4-[(1-amino-4-sulfonato-2-naphthyl)azo]phenyl]phenyl]azo-naphthalene-1-sulfonate is a noteworthy characteristic of this compound.

Key Points about Solubility:

  • Highly Soluble in Water: This compound exhibits high solubility in water due to the presence of sulfonate groups, which are known to facilitate dissolution.
  • pH Dependence: The solubility can be influenced by the pH of the solution; generally, higher pH values may enhance solubility.
  • Temperature Effects: Increasing the temperature typically leads to higher solubility for this type of compound.
  • Applications: Its water solubility makes it particularly useful in various applications such as dyeing, where uniform dispersion in aqueous media is crucial.

In summary, the solubility profile of this compound underscores its utility in various chemical and industrial practices. As a water-soluble dye, it can be effectively utilized in scenarios requiring excellent solvation properties, making it an invaluable chemical in both laboratory and practical applications.

Interesting facts

Interesting Facts about Disodium 4-amino-3-[4-[4-[(1-amino-4-sulfonato-2-naphthyl)azo]phenyl]phenyl]azo-naphthalene-1-sulfonate

This compound, known commonly as a dye, belongs to a category of substances that have significant implications in both industrial applications and scientific research.

Overview of the Compound

Disodium 4-amino-3-[4-[4-[(1-amino-4-sulfonato-2-naphthyl)azo]phenyl]phenyl]azo-naphthalene-1-sulfonate is a complex azo dye that exhibits rich color properties. Azo compounds, which contain the functional group -N=N-, are notable for their vivid colors, primarily due to their ability to absorb certain wavelengths of light.

Key Features:

  • Color and Stability: Azo dyes are known for their stable coloring characteristics, making them excellent choices for materials that require persistent colors.
  • Applications: This compound is utilized in various fields including textiles, food industry, and biological staining, showcasing its versatility.
  • Environmental Considerations: While azo dyes provide vibrant colors, their environmental impact is a point of consideration; many may break down into harmful substances, leading to increased scrutiny in chemical regulations.
  • Scientific Research: In research settings, azo dyes are often employed as model compounds to study ligand interactions and the behavior of complex biological systems.

Quote to Consider:

As the renowned chemist Robert H. Grubbs once said, “Chemical compounds are the stepping stones of knowledge in chemistry.” This compound stands testament to the intricate dance of chemistry, illustrating how a single structure can impact many domains.

Final Thoughts:

Studying disodium 4-amino-3-[4-[4-[(1-amino-4-sulfonato-2-naphthyl)azo]phenyl]phenyl]azo-naphthalene-1-sulfonate reveals not only the fascinating world of dyes but also invites discussions on safety, sustainability, and applications in modern science. This compounds serves as a prime example of how chemistry intermingles with everyday life and industry.

Synonyms
Congo red
573-58-0
C.I. Direct Red 28
Haemomedical
CCRIS 2277
AI3-63036
DTXSID4022816
NSC-7232
sodium diphenyldiazo-bis-alpha-naphthylaminesulfonate
NSC-56651
Disodium 3,3'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(4-aminonaphthalene-1-sulphonate)
Congo Red RS
disodium 3,3'-(biphenyl-4,4'-diyldidiazene-2,1-diyl)bis(4-aminonaphthalene-1-sulfonate)
Congo red [USP]
HSDB 4225
NSC 7232
EINECS 209-358-4
NSC 56651
1-NAPHTHALENESULFONIC ACID, 3,3'-((1,1'-BIPHENYL)-4,4'-DIYLDIAZO)BIS(4-AMINO-, DISODIUM SALT
1-naphthalenesulfonic acid, 3,3'-([1,1'-biphenyl]-4,4'-diyldiazo)bis[4-amino-, disodium salt
CONGO RED [MI]
CONGO RED [HSDB]
Natrium-salz der diphenyl-bis-azo-bis-naphthylamin-4-sulfonsaeure [German]
CONGO RED [MART.]
CONGO RED [WHO-DD]
CHEBI:34653
Natrium-salz der diphenyl-bis-azo-bis-naphthylamin-4-sulfonsaeure
1-Naphthalenesulfonic acid, 3,3'-(4,4'-biphenylenebis(azo))bis(4-amino-, disodium salt
DISODIUM 3,3'-(BIPHENYL-4,4'-DIYLDIDIAZENE-2,1-DIYL)BIS(4-AMINONAPHTHALENE-1-SULPHONATE)
1-naphthalenesulfonic acid, 3,3'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(4-amino)-, disodium salt
1naphthalenesulfonic acid, 3,3'((1,1'biphenyl)4,4'diylbis(azo))bis(4amino, disodium salt
1naphthalenesulfonic acid, 3,3'(4,4'biphenylenebis(azo))bis(4amino, disodium salt
direct red dccf
disodium 3,3'((1,1'biphenyl)4,4'diylbis(azo))bis(4aminonaphthalene1sulphonate)
dtxcid701507909
natriumsalz der diphenylbisazobisnaphthylamin4sulfonsaeure
nsc-75913
red, congo
sodium diphenyldiazo-bis-alpha-naphthylamine-sulfonate
sodium diphenyldiazobis(alphanaphthylaminesulfonate)
DIRECT RED 28
Congo Red 4B
Congazone sodium
Benzo Congo Red
Haemonorm
Hemorrhagyl
Solucongo
Sugai Congo Red
Atul Congo Red
Vondacel Red CL
Kayaku Congo Red
Mitsui Congo Red
Cotton Red L
Direct Red K
Azocard Red Congo
Congo Red H
Congo Red L
Congo Red M
Congo Red N
Congo Red R
Congo Red W
Congo Red CR
Congo Red WS
Atlantic Congo Red
Cotton Red 4BC
Cotton Red 5B
Erie Congo 4B
Tertrodirect Red C
Hispamin Congo 4B
Congo Red 4BX
Red K
Diacotton Congo Red
Peeramine Congo Red
Trisulfon Congo Red
Direct Red DC-CF
Brasilamina congo 4B
Direct Red C
C.I. 22120
Kongorot
Congo Red ICI
C.I. Direct Red 28, disodium salt
MFCD00004028
Congo Red (C.I. 22120)
CI Direct Red 28
3U05FHG59S
1-Naphthalenesulfonic acid,3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[4-amino-, disodium salt
Cosmos Red
Cotton Red B
Cotton Red C
Direct Red R
Direct Red Y
Congo Red (90%)
Kongorot [German]
DTXCID502816
Cerven kongo [Czech]
Cerven kongo
Cerven prima 28 [Czech]
DirectRed28
Cerven prima 28
CAS-573-58-0
Sodium 3,3'-([1,1'-biphenyl]-4,4'-diylbis(diazene-2,1-diyl))bis(4-aminonaphthalene-1-sulfonate)
NCGC00159364-02
UNII-3U05FHG59S
congo-red
Direct Congo Red
Congo Red K
disodium 3,3'-[biphenyl-4,4'-diyldi(E)diazene-2,1-diyl]bis(4-aminonaphthalene-1-sulfonate)
Congo Red sodium salt
C.I.Direct Red 28
Congo Red, indicator grade
Congo Red, certifiable grade
SCHEMBL25635
1-Naphthalenesulfonic acid, 3,3'-((1,1'-biphenyl)-4,4'-diylbis(azo))bis(4-amino-, disodium salt
Congo Red, JIS special grade
Congo Red, analytical standard
CHEMBL429694
C32H22N6O6S2.2Na
IQFVPQOLBLOTPF-UHFFFAOYSA-L
GLXC-20473
Congo Red, Dye content >=35 %
Tox21_111605
Tox21_202934
HB0737
AKOS000282971
AKOS016368576
AKOS024285600
FD03839
NCGC00260480-01
DA-52047
disodium 4-amino-3-[[4-[4-[(1-amino-4-sulfonatonaphthalen-2-yl)diazenyl]phenyl]phenyl]diazenyl]naphthalene-1-sulfonate
SY010430
C.I. Direct Red 28, disodium salt (8CI)
NS00020843
Congo Red, High Purity - CAS 573-58-0
D89267
Q114391
Congo Red, BioXtra, certified by the Biological Stain Commission
Congo Red, for microscopy (Bact., Bot., Hist.), indicator (pH 3.0-5.2), Reag. Ph. Eur.
1-Naphthalenesulfonic acid, 3,3'-((1,1'-biphenyl)-4,4'-diylbis(2,1-diazenediyl))bis(4-amino-, sodium salt (1:2)
1-Naphthalenesulfonic acid, 3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis[4-amino-, disodium salt (9CI)
3,3'-[[1,1'Biphenyl]-4,4'-diylbis(azo)-]bis[4-amino-1-naphthalenesulfonic acid] disodium salt