Methyl red sodium salt is a chemical substance discovered in the early 1950s and is also a visible light emission enhancer (composite pigment). It is composed of alkaline substances (methyl sodium) and sulfates (red sodium), with a molecular formula of Na2S2042H20 and CAS 845-10-3. Currently, it has been widely used in the preparation and modification of solid red dyes and is one of the most important additives in solid dyes and colorants. Its physical properties are mainly influenced by the composition ratio of sodium and sulfate in the raw materials, as well as the number of water molecules in the molecular formula. Its solubility is particularly high in water and it is an easily soluble ion. The structure of product is a dimer, and there is a hydration reaction between two molecules, which is the reason for its bilayer structure in the molecular structure, making it a visible light emission enhancer (composite pigment). It has a wide range of applications, mainly for the preparation of solid red dyes and modification. This dye is called "methyl red sodium coloring agent". It has excellent water resistance and washing resistance, and is currently one of the most commonly used coloring agents. It can be used in industries such as dyes, dye coatings, dye printing and dyeing, textile dyeing, etc.
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Chemical Formula |
C15H14N3O2- |
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Exact Mass |
268 |
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Molecular Weight |
268 |
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m/z |
268 (100.0%), 269 (16.2%), 270 (1.2%), 269 (1.1%) |
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Elemental Analysis |
C, 67.15; H, 5.26; N, 15.66; O, 11.93 |
Methyl red sodium salt, with the chemical formula C15H14N3NaO2, is a multifunctional and widely used chemical substance, particularly demonstrating its unique value in fields such as chemical analysis, biological research, and environmental monitoring.
1. Research and Teaching
It also plays an important role in the fields of scientific research and teaching. It is one of the indispensable reagents used in many laboratories for various chemical experiments and scientific research. By utilizing its characteristics, researchers can delve into the mechanisms and laws of chemical reactions, providing strong support for scientific discoveries and technological innovations. At the same time, sodium phenyl red is also an important tool in chemistry teaching. Demonstrating its color changes and other characteristics can help students better understand the principles and applications of acid-base indicators.
2. Ion concentration measurement
In addition to serving as an acid-base indicator, it can also be used to detect and measure ion concentration in aqueous solutions. By adjusting the pH value of the solution and adding Methyl Red solution sodium salt, color changes can be observed, and the concentration of specific ions in the solution can be inferred. This characteristic makes methyl red solution sodium salt have broad application prospects in fields such as environmental monitoring and water quality analysis. For example, it can be used to detect the concentration of radioactive ions in water and help evaluate water quality safety.
3. Microbiological applications
In the field of microbiology, it is also used as an important staining agent and identification tool. It is mainly used to identify specific types of bacteria, such as Escherichia coli. IMViC (Indole, Methyl Red, Voges Proskauer, and Citrate Utilization or Catalase Production Test) is a biochemical testing method used to distinguish between coliforms, of which methyl red is an important component. Through IMViC testing, it is possible to quickly and accurately identify Escherichia coli and other related bacteria, which is of great significance for public health and food safety.
4. Biological dyes
It is also a biological staining agent that can be used for staining and observation of cells and tissues. In medical and biological research, cell and tissue staining is an important means of observing and analyzing cell morphology, structure, and function. Being able to bind and color specific components within cells helps researchers see the internal structure and changes of cells more clearly. For example, in hematological research, methyl red sodium salt can be used to stain red blood cells and white blood cells; In histological research, it can be used to stain different types of tissue sections.
5. Chemical reaction analysis
It also plays an important role in chemical reaction analysis. It can be used as an oxidation-reduction indicator to participate in the monitoring and quantitative analysis of certain chemical reactions. For example, in the process of titrating ferrous ions with cerium sulfate, it can be used as an indicator to determine the endpoint of the titration. In addition, methyl red solution sodium salt can also be used to detect hydrate solutions of ions in chemical reactions and the processes and results of other related chemical reactions.
6. Industrial applications
In the industrial field, it also has a wide range of applications. Due to its excellent dyeing performance and stability, it is often used as a raw material or additive for dyes and pigments. In industries such as textiles, leather, plastics, etc., it can be used for dyeing and coloring treatment, giving products bright colors and long-lasting hues. In addition, it can also be used as a raw material or intermediate for certain chemical products to participate in industrial production processes.
7. Safety and Environmental Protection
Although it has wide application value in multiple fields, its use also requires attention to safety and environmental issues. It is slightly harmful to water, so undiluted or large amounts of the product should be avoided from coming into contact with groundwater, waterways, or sewage systems during use. Meanwhile, due to its certain chemical activity, personal and environmental protection measures should be taken when using it to avoid harm to human health and the environment. However, it is worth noting that methyl red solution sodium salt itself is a non-toxic and harmless chemical substance that does not cause carcinogenic or toxic reactions, so it can be safely used under appropriate conditions.
Methyl red sodium salt, as an important acid-base indicator and dye raw material, involves multiple chemical reaction steps in its synthesis process, including diazotization, coupling, and subsequent sodium salt formation.
Raw material preparation
Main raw materials:
P-Aminobenzenesulfonic acid (or similar aromatic amine compounds): as a precursor for diazotization reaction.
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Sodium nitrite: used to generate diazonium salts.
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Hydrochloric acid: regulates the acidity of the reaction system and promotes diazotization reaction.
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Sodium hydroxide: used for the sodiation of methyl red.
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Solvent and additives:
Water:
As one of the reaction solvents.
Ethanol:
Sometimes used to dissolve methyl red or as a reaction medium.
Ice:
Used to control reaction temperature, especially in diazotization reactions.
Sodium carbonate or sodium bicarbonate:
used to adjust the pH value of coupling reactions.
Safety preparation:
(1)
Wear appropriate personal protective equipment, including chemical protective clothing, goggles, gloves, etc.
(2)
Ensure good ventilation in the laboratory to avoid the accumulation of toxic gases.
(3)
Prepare emergency response measures, such as neutralizing agents, eye wash, etc.
Synthesis of Methyl Red
1. diazotization reaction
(1)
Dissolve para aminobenzenesulfonic acid in an appropriate amount of water and add an appropriate amount of hydrochloric acid to adjust the pH to the acidic range (usually pH<2).
(2)
Slowly add sodium nitrite solution (dissolved in a small amount of water) dropwise to the solution under ice bath conditions, while stirring. The droplet acceleration should be controlled to ensure that the temperature of the reaction solution does not exceed 5 ° C, in order to avoid violent reactions and the generation of by-products.
(3)
After the dropwise addition is complete, continue stirring the reaction solution for a period of time (usually half an hour to one hour) to allow the diazotization reaction to proceed completely. At this point, the reaction solution should appear orange yellow or reddish brown, indicating the formation of diazonium salts.
2. Coupling reaction
(1)
Dissolve N, N-dimethylaniline in an appropriate amount of water or ethanol, and add an appropriate amount of sodium carbonate or sodium bicarbonate to adjust the pH to the alkaline range (usually pH>8).
(2)
Slowly add the above diazonium salt solution dropwise to the N, N-dimethylaniline solution while maintaining stirring and appropriate temperature (usually between 0 ° C and room temperature).
(3)
After the dropwise addition is complete, continue stirring the reaction solution for a period of time (usually a few hours) to allow the coupling reaction to proceed completely. At this point, the color of the reaction solution will gradually change to red or orange red, indicating that methyl red has been generated.
3. Purification and post-processing
(1)
Filter the coupling reaction solution to remove unreacted raw materials and by-products.
(2)
After concentrating or evaporating the filtrate to a certain volume, add an appropriate amount of solvent (such as ethanol) for recrystallization. Temperature and time need to be controlled during the recrystallization process to obtain high-purity methyl red crystals.
(3)
Wash the recrystallized methyl red crystals several times with cold water to remove residual solvents and impurities.
(4)
Finally, place the methyl red crystals in a vacuum drying oven and dry them to a constant weight for later use.
Preparation of Methyl Red Sodium Salt
(1)
Dissolve the dried methyl red crystals in an appropriate amount of ethanol or water (choose the solvent based on the solubility of methyl red).
(2)
Slowly add sodium hydroxide solution (sodium hydroxide dissolved in a small amount of water) while stirring until the reaction solution becomes alkaline (usually pH>10). At this point, a slight change in the color of the solution can be observed, but overall it remains stable.
(3)
Continue stirring the reaction mixture for a period of time (usually half an hour to one hour) to ensure complete conversion of methyl red into its sodium salt form.
(4)
Evaporate the reaction solution to dryness or carry out spray drying to remove the solvent and obtain the solid product of methyl red solution sodium salt.
The synthesis of methyl red solution sodium salt is a complex process involving multiple chemical reaction steps. High purity methyl red solution sodium salt products can be obtained by precise control of reaction conditions, selection of suitable raw materials and solvents, and necessary purification and post-treatment steps. In practical operation, it is necessary to strictly comply with laboratory safety regulations and operating procedures to ensure the smooth progress of experiments and personal safety. In addition, with the continuous development and progress of science and technology, new synthesis methods and optimization strategies will continue to emerge, providing more efficient and environmentally friendly ways for the preparation of methyl red solution sodium salt.
FAQ
1. What are its main chemical applications?
It is mainly used in the Suzuki coupling reaction. As a precursor of aryl iodides, it efficiently forms carbon-carbon bonds with halogenated aromatic compounds or alkenes under palladium catalysis. It is a commonly used building block for synthesizing drug intermediates and liquid crystal materials.
2. What are its important physical and chemical properties?
At room temperature, it is a white to off-white crystalline powder and is relatively stable to air and humidity. The boronic group can reversibly combine with diol compounds, and the iodine atom endows it with high reactivity in coupling reactions.
3. What should be noted when using and storing?
It should be stored in a sealed, dark and dry environment. During operation, protective equipment must be worn to avoid inhaling dust. The borate group in it may have an effect on certain biological targets, so attention should be paid to biological safety.
4. What are some common related derivatives or application fields?
It can serve as a precursor for synthesizing more complex aryl borates, and is widely applied in materials science (such as OLED), pharmaceutical research (such as the synthesis of kinase inhibitors), and as a molecular probe in carbohydrate recognition studies.
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