Alizarin powder, also known as 1,2-dihydroxynthraquinone, is an organic compound with the molecular formula C14H8O4. The appearance is orange red crystals or ochre yellow powder. Easily soluble in hot methanol and 25 ℃ ether. Easily soluble in hot methanol and 25 ℃ ether. It is soluble in benzene, glacial acetic acid, pyridine, carbon disulfide, and slightly soluble in water. Used for synthesizing acid dye mordant red S-80, etc; Dye intermediates, acid-base indicators.
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Chemical Formula |
C14H8O4 |
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Exact Mass |
240 |
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Molecular Weight |
240 |
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m/z |
240 (100.0%), 241 (15.1%), 242 (1.1%) |
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Elemental Analysis |
C, 70.00; H, 3.36; O, 26.64 |
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1,2-Dihydroxyanthraquinone (Alizarin), also known as Alizarin, is an organic compound with the molecular formula C14H8O4. It usually exists in the form of orange red crystals or reddish brown powder, with specific solubility properties. It is easily soluble in hot methanol and 25 ℃ ether, as well as in benzene, glacial acetic acid, pyridine, and carbon disulfide, but slightly soluble in water.
Dyes and pigments
(1) Acid dye medium
It is an important raw material for the synthesis of acid dyes such as mordant red S-80. These dyes are used in the textile industry for dyeing and printing, especially in the dyeing process of fibers such as silk, wool, and nylon, exhibiting excellent dyeing performance and fastness.
(4) Staining of neural tissue and protozoa
Used as a staining agent in histological and biological research for in vivo staining of neural tissue and protozoa. It can selectively stain calcium ions by forming salts with intracellular calcium deposits, which is crucial in studying cell structure and function.
Pharmaceutical and Biochemical Research
(1) Drug synthesis
It also has applications in the field of drug synthesis. For example, it can be used as a raw material for synthesizing anticancer drugs, such as 1,4-di [2- (dimethylamino) ethylamino] -5,8-dihydroxyanthraquinone, which has shown potential in cancer treatment.
(2) Anti inflammatory effect
Research has shown that it has an inhibitory effect on the growth of Staphylococcus aureus and can suppress the permeability of rat skin connective tissue, thus possibly having anti-inflammatory effects. This discovery provides a basis for its application in the development of anti-inflammatory drugs.
(3) Cosmetics pigments
Because of its good color performance and stability, it can be safely used as cosmetics pigment and lipstick pigment without any side effects on the skin. This makes it have potential application value in the cosmetics industry.
Optoelectronic performance
(1) Optoelectronic materials
It has a large conjugated group and good electron withdrawing properties, which makes it versatile in terms of optoelectronic properties. In recent years, research has found that naturally derived molecules with ultrafast spectral insight exhibit efficient energy dissipation involving hydrogen bonding networks and proton motion, resulting in high photostability. This characteristic makes it have potential application prospects in the fields of optoelectronic materials such as photovoltaics, light-emitting diodes, transistors, and semiconductors.
(2) Light induced mechanism
The light induced mechanisms include charge/energy transfer, electron (de) localization, and excited state proton transfer, which are closely related to functional properties such as optical absorption, fluorescence quantum yield, conductivity, and photostability. By studying these mechanisms, the application efficiency in optoelectronic performance can be further improved.
Other applications
(1) Drip reagents for aluminum, indium, mercury, zinc, and zirconium
It can be used as a drop reagent for these metals, for rapid detection and quantitative analysis of metal ions.
(4) Cooperate with phenolic hydroxyl and aniline derivatives
It can be combined with compounds such as phenolic hydroxyl groups and aniline derivatives to form composite materials with specific functions. These composite materials have broad application prospects in fields such as dyes, coatings, plastics, etc.
(2) Textile dyeing
Since ancient times, it has been used for dyeing textiles. It can not only be used directly as a dye, but also combined with other compounds to form dyes with specific colors and properties, thus meeting the diverse needs of textile dyeing.
(3) Non irritating oxidative hair dye additives
Combined with some phenolic hydroxyl and aniline derivatives, it can be used as a non irritating oxidative dye additive. This additive can make hair color soft and long-lasting, without causing irritation or damage to the scalp and hair.
We can expect to make more progress in the following areas:
Development of new dyes and pigments:
By improving synthesis methods and optimizing process conditions, more new dyes and pigments with excellent performance and environmental characteristics can be developed. These dyes and pigments will have a wider range of applications in fields such as textiles, printing, and coatings.
Drug synthesis and new drug development:
By utilizing the unique chemical properties of 1,2-dihydroxyanthraquinone, more biologically active compounds can be synthesized and used for the development of new drugs. These new drugs may have potential application value in cancer treatment, anti-inflammatory effects, and other areas.
Optimization and improvement of optoelectronic performance:
By studying the photo induced mechanism and optoelectronic properties of 1,2-dihydroxyanthraquinone, its application efficiency in fields such as photovoltaics, light-emitting diodes, transistors, and semiconductors can be further optimized and improved. This will provide new impetus and support for the development of the optoelectronic industry.
Alizarin powder, namely 1,2-dihydroxy-9,10-anthraquinone, is an important organic pigment widely used in textile and dye industries. Since the mid-19th century, various synthetic methods have been discovered to prepare Alizarin.
1. Koch-Haaf reaction:
A method for the preparation of Alizarin was first reported by Koch and Haaf in 1869. This method involves the reduction and decarboxylation of 1,2-phenylediones followed by oxidation of the resulting 1,2-dihydroxyanthracene. The main steps of Koch-Haaf synthesis are as follows:
1) Reduce 1,2-phenyldione to 1,2-phenyldiol with a reducing agent such as sodium hydroxide or red phosphorus.
2) Decarboxylate 1,2-phenyldiol under acidic conditions to obtain 1-hydroxy-2-ketoanthracene.
3) Oxidize 1-hydroxy-2-ketoanthracene to 1,2-dihydroxyanthracene, namely Alizarin, with an oxidizing agent.
The main advantage of the Koch-Haaf reaction is that the required raw materials are readily available. This method played an important role in the dye industry from the late 19th century to the early 20th century.
2. Barrett-Haas reaction:
The main steps are as follows:
1) Add concentrated sulfuric acid or phosphoric acid to the solution to convert 2-nitrophenol into 2-nitrobenzene.
2) Hydroxidize nitro compounds with sodium hydroxide to generate dinitro compounds.
3) Under alkaline conditions, dinitro compounds are condensed to generate Alizarin.
The advantage of the Barrett-Haas reaction is that the raw materials used in this method are simple and easy to obtain, but the conversion rate of this reaction is low, and the quality of the obtained product is low.
3. Herrmann synthesis:
The main steps are as follows:
1) Oxidize 1,8-dinaphthol with hydrogen peroxide, sodium peroxide or perchloric acid to generate 1,8-dihydroxynaphthoquinone.
2) Under alkaline conditions, 1,8-dihydroxynaphthoquinone undergoes an intramolecular cyclization reaction to generate Alizarin.
The advantage of the Herrmann synthesis is that the starting materials used in this method are readily available and fewer reagents are required. However, although this method has a high conversion rate, it requires a higher reaction temperature and a longer reaction time, and the quality of the obtained Alizarin is unstable.
4. Bouveault dye method:
The main steps are as follows:
1) 1,4-dimethoxyanthracene is prepared by reducing anthraquinone using sodium or potassium as a reducing agent.
2) Under acidic conditions, 1,4-dimethoxyanthracene reacts at high temperature to obtain Alizarin methyl ether.
3) Alizarin methyl ether is heated and hydrolyzed under acidic conditions to produce Alizarin.
The main advantage of the Bouveault dye method is that the raw materials required by the method are simple and easy to obtain, and Alizarin can be directly obtained after the reaction. But this method needs high temperature and long time reaction, and the purity of the obtained product is relatively low.
Alizarin powder acts as an acid-base indicator, with a 0.5% solution of alizarin appearing yellow at pH 5.5 and turning red at pH 6.8.
This color change makes it a very sensitive and reliable acid-base indicator that helps scientists quickly and accurately determine the acid-base nature of a solution.
In the laboratory, acid-base indicators are indispensable tools in the process of chemical analysis. It is often used in a variety of acid-base titration experiments due to its sharp color change and ease of preparation.
For example, when determining the pH of an unknown solution, scientists can add a few drops of alizarin solution and observe the color change of the solution. If the solution shows yellow color, then it can be initially judged that the pH value of the solution is lower than 5.5;
if the solution turns red, then it can be judged that the pH value of the solution is higher than 6.8. Of course, in order to more accurately determine the pH value of the solution, it is necessary to analyze the solution in conjunction with other experimental methods and instruments.
In addition, it has a certain selectivity as an acid-base indicator. In some specific chemical reactions, it is able to react with other substances in a specific color, thus enabling the detection and quantitative analysis of the target substance. This selectivity makes it also has a wide range of application prospects in the field of environmental monitoring, food safety, drug analysis and other fields.
However, it should be noted that the color variation range of it is limited when it is used as an acid-base indicator. Therefore, in practical applications, it is necessary to choose the appropriate indicator according to the specific experimental needs and the acid-base nature of the solution. At the same time, the storage conditions and use of it also need to be strictly controlled to ensure its stability and accuracy.
as a sensitive and reliable acid-base indicator, it plays an important role in chemical analysis, environmental monitoring, food safety and other fields. With the continuous development of science and technology, the application of it will continue to expand and deepen.
In conclusion, various chemical synthesis methods have been found to prepare Alizarin powder. Each method has its advantages and disadvantages, and it needs to be selected according to the actual situation. Although the reaction steps of these methods are not the same, their basic principles are the same, and they all use chemical reactions to convert raw materials into Alizarin under appropriate conditions.
Frequently Asked Questions
What is alizarin used for?
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In clinical practice, it is used to stain synovial fluid to assess for basic calcium phosphate crystals. Alizarin has also been used in studies involving bone growth, osteoporosis, bone marrow, calcium deposits in the vascular system, cellular signaling, gene expression, tissue engineering, and mesenchymal stem cells.
Is alizarin safe?
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Alizarin Crimson in Georgian oil paints may contain pigments that can be toxic if ingested or inhaled as dust or fumes. Avoid skin contact and use in well-ventilated areas to minimize exposure.
What is alizarin made of?
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Alizarin is made from coal tar, a by-product of the production of coke and coal gas. It was the first synthetic (human-made) dye to replicate a natural dye, specifically madder red from the madder plant. The name "alizarin" comes from the Arabic word for madder (alizari).
What is the common name for alizarin?
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Turkey Red
Alizarin, a common name Turkey Red or Mordant Red 11, is a water and alcohol-soluble natural colorant derived from the roots of plants of the Rubiaceae family (e.g., Rubia cordifolia L., R. tinctorum)].
Is alizarin red toxic?
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Alizarin red S (ARS) is a widespread mordant dye derived from alizarin. However, it was reported to be mutagenic and carcinogenic probably because it could induce oxidative damages in organisms.
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