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Congo Red

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Identification
Molecular formula
C32H22N6Na2O6S2
CAS number
573-58-0
IUPAC name
disodium;4-[2-[3-(hydroxymethyl)-4,6-dioxo-5-[(4-sulfonato-1-naphthyl)hydrazono]cyclohex-2-en-1-ylidene]hydrazino]naphthalene-1-sulfonate
State
State

At room temperature, Congo Red is typically a solid. It is often found in a powdered form that can dissolve in water to form a colored solution, which is commonly used as a pH indicator.

Melting point (Celsius)
360.00
Melting point (Kelvin)
633.15
Boiling point (Celsius)
0.00
Boiling point (Kelvin)
0.00
General information
Molecular weight
696.67g/mol
Molar mass
696.6650g/mol
Density
1.2923g/cm3
Appearence

Congo Red appears as a red to dark brown powder or granular solid. It is a water-soluble dye known for its intense red color. In solution, it can appear lighter or darker depending on the concentration and the medium used.

Comment on solubility

Solubility of Disodium;4-[2-[3-(hydroxymethyl)-4,6-dioxo-5-[(4-sulfonato-1-naphthyl)hydrazono]cyclohex-2-en-1-ylidene]hydrazino]naphthalene-1-sulfonate

This complex compound, characterized by its disodium salt form, showcases intriguing solubility properties that can vary significantly based on environmental conditions. In general, the solubility of compounds like this one can be influenced by several factors:

  • pH Levels: The solubility may increase in highly acidic or basic conditions due to the ionization of functional groups.
  • Temperature: Increasing temperature often enhances solubility, allowing more of the compound to dissolve in solution.
  • Presence of Solvents: The type of solvent used can greatly affect solubility; polar solvents like water may facilitate higher solubility compared to non-polar solvents.
  • Concentration: In concentrated solutions, the solubility reaches a limit beyond which no more solute can dissolve, leading to potential precipitation.

Reports indicate that compounds with sulfonate groups tend to exhibit good solubility in aqueous solutions due to their ionic character. Emphasizing this aspect, “the ionic nature of the sulfonate group greatly contributes to its ability to interact favorably with water molecules.”
Thus, it's expected that disodium;4-[2-[3-(hydroxymethyl)-4,6-dioxo-5-[(4-sulfonato-1-naphthyl)hydrazono]cyclohex-2-en-1-ylidene]hydrazino]naphthalene-1-sulfonate would show appreciable solubility in water, making it useful in various applications, particularly in biological and industrial systems where aqueous environments are prevalent.

Interesting facts

Interesting Facts about Disodium 4-[2-[3-(Hydroxymethyl)-4,6-dioxo-5-[(4-sulfonato-1-naphthyl)hydrazono]cyclohex-2-en-1-ylidene]hydrazino]naphthalene-1-sulfonate

Disodium 4-[2-[3-(hydroxymethyl)-4,6-dioxo-5-[(4-sulfonato-1-naphthyl)hydrazono]cyclohex-2-en-1-ylidene]hydrazino]naphthalene-1-sulfonate is a remarkable compound with intriguing properties and applications. Here are some fascinating points:

  • Dyes and Indicators: This compound is often used in the synthesis of various dyes. Its unique structure allows it to exhibit vibrant colors, making it valuable in the textile industry.
  • Biological Significance: Research has highlighted its potential in biological systems, particularly in its role as a colorimetric indicator for detecting certain biochemical substances.
  • Research Applications: The compound has garnered interest in scientific research for its potential applications in drug delivery systems. The sulfonate group enhances its solubility and interaction with biological molecules.
  • Environmental Focus: As environmental awareness grows, compounds like this one are studied for their potential environmental impact and their role in remediation processes.
  • Complex Structure: The intricate structure of this compound encompasses multiple functional groups, which contribute to its reactivity and utility in various chemical reactions and materials science.

In conclusion, disodium 4-[2-[3-(hydroxymethyl)-4,6-dioxo-5-[(4-sulfonato-1-naphthyl)hydrazono]cyclohex-2-en-1-ylidene]hydrazino]naphthalene-1-sulfonate embodies the remarkable interplay between structure and function in chemistry, showcasing how a single compound can hold diverse applications across different fields.

Synonyms
disodium;4-[2-[3-(hydroxymethyl)-4,6-dioxo-5-[(4-sulfonatonaphthalen-1-yl)hydrazinylidene]cyclohex-2-en-1-ylidene]hydrazinyl]naphthalene-1-sulfonate
Chocolate Brown HT (Technical Grade)
Disodium;4-[(2Z)-2-[(5Z)-3-(hydroxymethyl)-4,6-dioxo-5-[(4-sulfonatonaphthalen-1-yl)hydrazinylidene]cyclohex-2-en-1-ylidene]hydrazinyl]naphthalene-1-sulfonate
BCP27990
4353-89-3
Q424541
CIFOODBROWN3;LS-194959 ;1538 Brown;C.I.20285;Certicol Brown N Extra