Tetrasodium Hydrogen 7-Hydroxy-8-[[4-[(3-Phosphonatophenyl)Azo]-2-Sulphonatophenyl]Azo]Naphthalene-1,3-Disulphonate

This is an organic compound with the Chinese name or 7-hydroxy-8- [[4- [ (3-phosphonylphenyl) azo] -2-sulfonylphenyl] azo] naphthalene-1,3-disulfonate tetrasodium hydrogen. Its molecular structure is complex, with a naphthalene ring core, a naphthalene ring connected to a disulfonate radical group at 1,3, a hydroxy group at 7, and a long chain containing an azo structure at 8. This long chain is composed of 4- [ (3-phosphonylphenyl) azo] -2-sulfonylphenyl.
From the structural analysis, the naphthalene ring is a stable aromatic system, which endows the molecule with certain conjugation stability. The hydroxyl group has active hydrogen and can participate in the formation of hydrogen bonds and chemical reactions. The sulfonic acid group imparts water solubility to the compound, because ionization allows the molecule to disperse in water. The azo structure is that the diazo group is connected to the aryl group, which has cis-trans isomerism and is sensitive to light and heat, or affects the stability and color change of the compound. Phosphorus atoms in phosphonyl groups can provide lone pair electrons and participate in coordination and other reactions.
This compound may be used as a chromophore in the field of dyes and pigments to provide color due to its unique structure; because of its sulfonic acid group, it improves solubility and dispersion in some surfactant systems; and because of its reactive group, it is further derived as an intermediate in organic synthesis.

This is a chemical compound, named tetrazene 7 - 8 - [ [ 4 - [ ( 3 - phosphonylphenyl) azo] - 2 - sulfonic acid phenyl] azo] naphthalene - 1,3 - disulfonic acid. Its use is good, often in the following domains.
In the dye industry, it has a good quality of bright color and can be used for dyeing materials such as rubber, leather, etc. Because of its special characteristics, it can be firmly combined with the dye, so that the dyeing effect is long-lasting, and the color is not easy to fade.
In the manufacture of inks, this compound plays an important role. It can improve the coloring performance of the ink, making the printing case clear and the color clear. And it can improve the ink flow, ensure the printing process, and avoid the production of paste, paste, etc.
In addition, in the chemical industry, it also has its own shadow. It can be used as a color product such as eyeshadow and mouth, which provides rich color. Because it has a certain safety and qualitative quality, it can protect the health of the user of the chemical product.
In the field of analysis, it can be used as an indicator. According to its color change in different environments, it can indicate the existence of a specific object or a specific object, and help the analysis.
7 - - 8 - [ [ 4 - [ ( 3 - phosphonylphenyl) azo] - 2 - sulfonylphenyl] azo] naphthalene - 1,3 - disulfonic acid

Tetrasodium Hydrogen 7 - Hydroxy - 8 - [4 - [ (3 - Phosphonatophenyl) Azo] -2 - Sulphonatophenyl] Azo] Naphthalene - 1,3 - Disulphonate is an organic compound with unique physical properties.
Looking at its morphology, it is often powdery, delicate and uniform, just like fine gravel, and it is difficult to see obvious particle differences in sunlight. The color of this powder is mostly light yellow, like the stamen of the first bloom, elegant and soft, not bright, but with a gentle state.
When it comes to solubility, it shows good solubility in water. When integrated into water, just like spring snow meets warm sun, it quickly dissipates, forming a uniform and transparent solution. And this solution is quite stable, and after a long time, there is no precipitation or delamination. In organic solvents, its solubility varies according to the properties of the solvent. In polar organic solvents, such as ethanol, it can be moderately dissolved, but the solubility is slightly inferior to that of water; in non-polar organic solvents, such as n-hexane, the solubility is extremely poor, just like oil and water, which are difficult to melt.
Its melting point, after fine determination, is about a certain temperature range. When heated to this temperature range, this compound melts like ice and snow, gradually transforming from solid to liquid. The characteristics of this melting point also provide a key reference for its processing and application under specific conditions.
As for the density, it is relatively moderate, neither light as a feather nor heavy as lead. It is within the density range of common organic compounds, laying the foundation for its behavior in many practical application scenarios.
In addition, the stability of this compound to light and heat is also worthy of attention. Under moderate light and temperature conditions, it can still maintain stable chemical structures and properties; however, if the light is too strong or the temperature is too high, its structure may change, affecting its original physical properties and chemical activities.

This is the method of preparing Tetrasodium Hydrogen 7 - Hydroxy - 8 - [[4 - [ (3 - Phosphonatophenyl) Azo] -2 - Sulphonatophenyl] Azo] Naphthalene - 1,3 - Disulphonate, and let me explain in detail.
Bear the brunt and start with the right raw materials. Aromatic amines and naphthenols with specific substituents can be selected. In the ancient method, the aromatic amines containing sulfonic acid groups and nitro groups are first taken, and they are reduced with an appropriate reducing agent, such as iron filings and hydrochloric acid. This is because the amino group is a key activity check point in the subsequent coupling reaction.
Then, the diazonium salt is prepared. The obtained aromatic amine compound is reacted with sodium nitrite under low temperature and acidic environment. If hydrochloric acid is used as the acidic medium, the temperature is controlled at 0-5 ° C, and the aromatic amine and sodium nitrite form a diazonium salt. This diazonium salt is active and is a key intermediate for subsequent coupling reactions.
Furthermore, take the naphthol derivative containing hydroxyl groups and sulfonic acid groups. The naphthol derivative is placed in an appropriate alkaline medium to convert its phenolic hydroxyl groups into phenoxy anions to enhance its nucleophilicity.
Then, the coupling reaction is carried out. The obtained diazonium salt is slowly added dropwise to the alkaline solution containing naphthol derivatives. The positive ions of the diazonium salt react with the phenoxy negative ions of the naphthol derivatives to form an azo-containing compound. During this reaction process, the reaction temperature, pH value and the ratio of the reactants need to be carefully adjusted to ensure that the reaction proceeds in the expected direction and the key structure of the target product is obtained.
After the reaction is completed, the product may contain impurities. At this time, classic separation and purification methods can be used. For example, extraction with an appropriate organic solvent is carried out to remove insoluble impurities. After recrystallization, a suitable solvent, such as a mixed solvent of ethanol and water, is selected to crystallize and precipitate the product in it to achieve the purpose of purification.
After this series of steps, careful operation may be obtained Tetrasodium Hydrogen 7 - Hydroxy - 8 - [[4 - [ (3 - Phosphonatophenyl) Azo] -2 - Sulphonatophenyl] Azo] Naphthalene - 1,3 - Disulphonate.

This is Tetrasodium Hydrogen 7 - Hydroxy - 8 - [4 - [ (3 - Phosphonatophenyl) Azo] -2 - Sulphonatophenyl] Azo] Naphthalene - 1,3 - Disulphonate. When using this agent, many matters need to be paid attention to.
First, it concerns its storage. It should be placed in a dry, cool and well-ventilated place, away from fire and heat sources. Because it may be sensitive to environmental humidity and temperature, improper storage or changes in its properties will affect the use effect. Just like proper storage of books, it can be retained for a long time.
Secondly, during use, be sure to strictly follow the established procedures and proportions. This agent has special properties, improper proportions, or difficult to achieve the desired effect, or even cause adverse chemical reactions. Just like the ancient method of alchemy, it is completely different, and it is a thousand miles away.
Furthermore, because it contains specific chemical groups, protective measures should be taken when using it. Appropriate protective equipment should be worn, such as gloves, goggles, etc., to avoid direct contact with skin and eyes. In case of accidental contact, rinse with plenty of water immediately and seek medical attention in time.
At the same time, the place of use should have good ventilation conditions to prevent the accumulation of harmful gases. And keep away from incompatible substances to prevent accidental reactions. After use, properly dispose of the remaining drugs and waste, and do not discard them at will to avoid polluting the environment. This is the use of Tetrasodium Hydrogen 7 - Hydroxy - 8 - [4 - [ (3 - Phosphonatophenyl) Azo] -2 - Sulphonatophenyl] Azo] Naphthalene - 1,3 - Disulphonate when attention should be paid to, related to safety and effect, must not be careless.