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5-sulfosalicylic acid powder, with two molecules of crystal water, the molecular formula is c7h6o6s · 2H2O. White crystal or crystalline powder, white crystal or crystalline powder, turns pink when it meets a trace of iron, and decomposes into phenol and salicylic acid at high temperature. It is soluble in ether and soluble in water and ethanol. It turns pink when it meets a small amount of iron and decomposes into phenol and salicylic acid at high temperature. Sulfosalicylic acid indicator is soluble in ether and soluble in water and ethanol. It is used as biochemical reagent, analytical reagent and complexing indicator, and colorimetric analysis to determine high iron ion. Determine iron ore, coal coke and limestone as raw materials of iron and steel. Intermediates for the manufacture of surfactants. Organic catalyst. Grease additive.
|
Chemical Formula |
C7H6O6S |
|
Exact Mass |
218 |
|
Molecular Weight |
218 |
|
m/z |
218 (100.0%), 219 (7.6%), 220 (4.5%), 220 (1.2%) |
|
Elemental Analysis |
C, 38.54; H, 2.77; O, 44.00; S, 14.69 |
5-Sulfosalicylic acid, chemical formula C ₇ H ₆ O ₆ S · 2H ₂ O (dihydrate), molecular weight 254.21, CAS number 5965-83-3. Its molecular structure contains sulfonic acid groups (- SO3H), carboxyl groups (- COOH), and phenolic hydroxyl groups (- OH), endowing it with strong acidity, high water solubility, and metal chelating ability. The physical properties are manifested as white crystalline powder, with a melting point of 106-110 ℃, easily soluble in water, ethanol, and ether, and turns pink when exposed to trace amounts of iron ions. It decomposes into salicylic acid and phenol at high temperatures. As a hazardous material (UN 1760, corrosive substance), its storage must be dark, cool, and dry, and transportation must comply with hazardous material management regulations.
1. Intermediate for drug synthesis
5-sulfosalicylic acid powder is a key intermediate of tetracycline antibiotics such as doxycycline and tetracycline. Taking methicillin as an example, in its synthesis pathway, It is esterified to produce methicillin hydrochloride, which is then subjected to desalination and crystallization to obtain the final product. This antibiotic is widely used to treat respiratory tract infections, urinary tract infections, and mycoplasma pneumonia. Its antibacterial spectrum covers both Gram positive and Gram negative bacteria, and is effective against penicillin resistant strains. In addition, It is also involved in the synthesis of hormone drugs (such as progesterone) and anti-inflammatory drugs (such as dexamethasone acetate), playing an important role in regulating endocrine function and inhibiting inflammatory responses.
2. Clinical testing reagents
In biochemical testing, It is used as a protein precipitant to form insoluble complexes with proteins for quantitative analysis of urinary proteins. Its sensitivity is higher than that of the heated acetic acid method, especially for detecting albumin, but it is susceptible to interference from urine pH, temperature, and drugs, and needs to be validated with other methods. In addition, its 0.2M aqueous solution can be used for photometric detection of uranium and trivalent iron ions (λ max 425nm), achieving quantitative analysis of trace metal ions by forming a purple red complex with Fe ³ ⁺.
1. Metal ion detection
It is a standard chromogenic reagent for the spectrophotometric determination of Fe ³ ⁺. The maximum absorption wavelength of its complex with Fe ³ ⁺ is 425nm, with a molar absorptivity of 5800 L · mol ⁻¹ · cm ⁻¹ and a detection limit as low as 0.01 mg/L. In addition, it can also serve as a masking agent to eliminate the influence of interfering ions such as Al ³ ⁺ and Ca ² ⁺ on the determination of Fe ³ ⁺. In industrial analysis, this reagent is used to detect the iron content in steel raw materials (iron ore, coal coke, limestone), as well as heavy metal ions such as lead, chromium, and copper in water quality monitoring, providing data support for environmental assessment and process control.
2. Complexation titration indicator
In EDTA complexometric titration, It is used as an indicator to indicate the titration endpoint through color change. For example, when measuring water hardness (total amount of Ca ² ⁺, Mg ² ⁺), it forms a red complex with metal ions. When titrated to the endpoint, EDTA captures the metal ions, and the solution changes from red to colorless. The endpoint determination sensitivity is high, with an error of less than 0.5%.
1. Dyes and surfactants
5-sulfosalicylic acid is a synthetic raw material for acid dyes (such as acid red and acid yellow) and direct dyes (such as direct black). Its sulfonic acid group enhances the water solubility and dispersibility of the dye, improves color fastness and brightness. As an intermediate of surfactants, it participates in the synthesis of sulfosalicylic acid salt surfactants for use in detergents, emulsifiers, and dispersants, reducing liquid surface tension and improving wetting and permeability properties.
2. Electroplating additives
In the cyanide free silver plating process, 5-sulfosalicylic acid powder acts as a complexing agent to form a stable complex with Ag ⁺, controlling the concentration of metal ions in the plating solution and improving the uniformity and adhesion of the coating. Compared to traditional cyanide plating solutions, it has lower toxicity and meets environmental requirements, and is widely used for surface treatment of electronic components and jewelry.
3. Lubricating grease additives
It as an anti-wear agent and preservative, forms a protective film by adsorbing onto metal surfaces, reducing mechanical friction and wear.
Its sulfonic acid groups can neutralize acidic substances, inhibit oxidation reactions, and extend the service life of lubricating grease. Under high temperature and high pressure conditions, adding lubricating grease containing It can increase the operating life of equipment by more than 30%.
4. Catalysts and polymerization aids
In organic synthesis, It serves as a catalyst to promote esterification, etherification, and other reactions. For example, in the synthesis of polyester resin, its carboxyl and sulfonic acid groups can adjust the reaction rate, control the molecular weight distribution, and improve product performance. In lotion polymerization, it acts as a pH regulator to stabilize the lotion system, prevent gel and improve the yield of polymerization products.
Emerging fields: from laboratory exploration to industrial application
1. Energy materials
5-sulfosalicylic acid is involved in the synthesis of lanthanide metal organic framework complexes (MOFs), whose sulfonic acid groups act as coordination sites to form three-dimensional pore structures with metal ions for gas adsorption (such as CO ₂ capture) and catalytic reactions (such as photocatalytic water splitting for hydrogen production). Research has shown that MOFs based on 5-sulfosalicylic acid have an adsorption capacity of up to 5 mmol/g for CO ₂, and can achieve an 8% photocatalytic hydrogen production efficiency under visible light.
2. Environmental governance
Adsorption materials modified with 5-sulfosalicylic acid, such as poly (5-sulfosalicylic acid) resin, have high selective adsorption capacity for heavy metal ions (such as Pb ² ⁺, Cd ² ⁺), with an adsorption capacity of up to 200 mg/g. They can be regenerated through acid washing and reused more than 5 times, making them suitable for industrial wastewater treatment and soil remediation.
3. Agriculture and Biological Stimulation
As a plant growth regulator, 5-sulfosalicylic acid powder can enhance crop stress resistance (such as drought and salt resistance). Experiments have shown that spraying 5-sulfosalicylic acid solution can increase the germination rate of corn seeds by 15% and the dry weight of seedlings by 20%. Its mechanism of action may be related to regulating the activity of antioxidant enzymes in plants.
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