Sodium 4(-2-Hydroxy-1-Naphthylazo)Naphthalenesulphonate

Sodium + 4% (-2 -hydroxy-1-naphthyl azo) naphthalene sulfonate, this substance is an organic compound, and its molecular structure contains the structure of naphthalene ring. From the structural analysis, the naphthalene ring is a fused dicyclic aromatic hydrocarbon with stable properties.
2-hydroxy-1-naphthalene azo moiety, 2-hydroxy-1-naphthalene is connected by azo group (-N = N -). Azo groups often have the characteristic of color, which makes the compound have color and is widely used in the field of dyes. Hydroxy (-OH) is a strong polar group, which can participate in the formation of hydrogen bonds and affect the solubility and reactivity of the compound.
Naphthalene sulfonate part, the sulfonic acid group (-SO
) is presented in the form of sodium salt (-SO < Na). The sulfonic acid group is a strong hydrophilic group, which greatly enhances the water solubility of the compound.
The structure of this compound combines the stability of the naphthalene ring, the colorability of the azo group, the hydroxy reactivity and the hydrophilicity of the sulfonic acid group, which determines its important use in dyes, pigments and some specific organic synthesis fields.

Sodium + 4% (-2-hydroxy-1-naphthyl-azo) sodium naphthalenesulfonate, which has a wide range of uses. In the printing and dyeing industry, it is often used as a dye aid, which can help dye even dyeing and solubilization, so that fabrics are evenly colored and bright in color. In the textile industry, it can improve the affinity of dyes to fibers, improve the dyeing rate, and reduce dye waste. It is also used in leather dyeing to help dyes bond firmly with leather and enhance dyeing fastness.
In the field of analytical chemistry, it can be used as an indicator of metal ions. Because it reacts with specific metal ions to form a characteristic color complex, metal ions can be determined and quantitatively analyzed. For example, in some metal ion titration experiments, the titration endpoint is accurately indicated by the color change.
In the biological field, it also has potential uses. Because of its azo structure and sulfonic acid group, it may be used for biomolecular markers to help track biomolecular activities and study physiological processes in organisms.
In summary, sodium + 4% (-2-hydroxy-1-naphthalenoazo) sodium naphthalene sulfonate has important uses in chemical, analytical, biological and other fields, and plays an indispensable role.

4% (-2-hydroxy-1-naphthyl-azo) naphthalene sulfonate of sodium is a kind of chemical substance. Its physical properties are quite characteristic. Looking at its morphology, at room temperature, it is mostly powdery, fine as dust and sand, and the particles are uniform. This state is easy to store and use.
When it comes to color, it often shows bright colors, or orange yellow, or nearly vermilion, eye-catching and bright. The reason for this color is its unique molecular structure, which has specific absorption and reflection of light.
Solubility is also an important physical property. In water, this substance has a certain solubility and can be slowly dissolved, causing the water body to show a little color and form a uniform dispersion system. However, its solubility is not infinite, and it will no longer dissolve to a certain extent. This property is related to its application in aqueous systems.
As for the melting point, it has a specific value after experimental measurement. When the temperature rises to a certain exact value, this substance gradually melts from solid to liquid. This melting point value is constant, which is one of the important indicators for the identification and purification of this substance.
Its density is also an inherent property. Compared with other substances, it is unique. In related chemical processes, it has a great impact on material ratio, separation and other operations.
In summary, the physical properties of 4% sodium (-2-hydroxy-1-naphthyl azo) naphthalene sulfonate, such as morphology, color, solubility, melting point, density, etc., are all key elements for the understanding and application of this substance, and are of great significance in chemical research and industrial practice.

To make 4 - (- 2 - hydroxy - 1 - naphthyl azo) sodium naphthalenesulfonate, you can follow the following methods:
First, you need to prepare the raw materials, namely 2 - naphthol, p-aminonaphthalenesulfonic acid, sodium nitrite, sodium hydroxide, etc. First make p-aminonaphthalenesulfonic acid diazotized, dissolve p-aminonaphthalenesulfonic acid into an appropriate amount of water, add an appropriate amount of sodium hydroxide to adjust to alkalinity, and dissolve it into a sodium salt. In a low temperature environment, slowly add the pre-prepared sodium nitrite solution, and add dilute hydrochloric acid dropwise, strictly control the temperature at 0 - 5 ° C, so that p-aminonaphthalenesulfonic acid
2-naphthol is alkali-dissolved for the second time, take an appropriate amount of 2-naphthol, add sodium hydroxide solution, heat and stir to dissolve 2-naphthol into 2-naphthol sodium salt solution. After
, the coupling reaction of diazo salt and 2-naphthol sodium salt is completed. The 2-naphthol sodium salt solution is slowly added to the diazo salt solution and stirred continuously. During the process, the temperature is strictly controlled to maintain the pH within a certain range. This reaction needs to be carried out under weakly alkaline conditions. After a period of reaction, it can be seen that there is precipitation in the solution, which is the crude product of 4- (-2-hydroxy-1-naphthyl azo) sodium naphthalenesulfonate.
Then the crude product is separated and purified, and the precipitation is filtered out by filtration method, and the precipitation is washed with an appropriate amount of cold water to remove impurities. After that, the filter cake can be recrystallized, and a suitable solvent, such as hot water or other suitable organic solvents, can be selected. After recrystallization, a relatively pure 4- (-2-hydroxy-1-naphthyl azo) sodium naphthalene sulfonate product can be obtained. During the operation, the temperature, pH and raw material dosage of each step need to be precisely controlled to obtain a high-quality product.

Sodium - 4% (-2-hydroxy-1-naphthyl azo) sodium naphthalenesulfonate, the use of this substance should pay attention to the following things:
First, it is related to safety protection. This is a chemical, and it must be used with appropriate protective equipment, such as gloves, goggles, etc., to prevent contact with the skin and eyes. Because it may be irritating, if you come into contact accidentally, you should immediately rinse with plenty of water and seek medical treatment if necessary. And the use environment should be well ventilated to avoid inhaling its dust or smoke to prevent respiratory irritation.
Second, about storage. Store in a dry, cool and ventilated place, away from fire and heat sources. It should be stored separately from oxidants, acids, etc., and should not be mixed to prevent dangerous chemical reactions. The storage container must be sealed to prevent it from getting wet or deteriorating.
Third, in terms of usage specifications. Be sure to read the relevant instructions and operating procedures carefully before use, and accurately grasp the usage method and dosage. When weighing, use precise instruments to ensure that the dosage is correct. When configuring the solution, add reagents in the correct order, paying attention to the dissolution conditions, such as temperature, stirring and other factors, to ensure that it dissolves fully and evenly.
Fourth, after use, the remaining substances cannot be discarded at will, and should be properly disposed of in accordance with relevant regulations. For the disposal of its waste, environmental protection requirements should be followed to prevent pollution to the environment. Experimental instruments should be cleaned in time after use to remove residual substances for next use.