Copper (II) acetate is an organotransition metal compound, also known as copper acetate. Its chemical formula is Cu(CH3COO)2 and CAS 142-71-2. Is a solid crystal, usually green to blue-green crystals. Its shape can be granular, powdery or crystalline, resembling a rhombus or octagon. It is a relatively stable compound, but its thermal stability will be reduced under high temperature, low oxygen atmosphere or ultraviolet irradiation. When it decomposes, it releases toxic and corrosive gases. Only slightly soluble in water, but more soluble in many organic solvents. It is soluble in benzene, ethanol, methanol, ether and acetal. It is also used in the production of materials, composites such as rubber and plastic, and in the manufacture of furniture and decorative items. Additionally, it is used in the production of fuel and explosives, as well as in the manufacture of spray paints and cosmetics. In short, it is a very important multifunctional compound with a wide range of applications.
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Chemical Formula |
C4H6O4- |
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Exact Mass |
181 |
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Molecular Weight |
182 |
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m/z |
181 (100.0%), 193 (44.6%), 182(4.3%), 184 |
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Elemental Analysis |
C, 26.45; H, 3.33; O, 35.23; Cu, 34.99 |
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Copper acetate (chemical formula: Cu(CH3COO)2· H2O), as a blue-green crystalline compound, has shown extensive application value in industry, agriculture, scientific research, and special fields. Its uses can be systematically classified into the following six categories, covering multiple dimensions from basic industry to cutting-edge technology:
Copper (II) acetate is an important catalyst in the field of organic synthesis, and its unique oxidation activity and Lewis acidity make it a key promoter of various reactions:
1. Alkyne coupling reaction
Can catalyze the coupling of two terminal alkynes to generate 1,3-diynes (as shown in the reaction formula: Cu ₂ (OAc) ₄+2RC ≡ CH → 2CuOAc+RC ≡ C-C ≡ CR+2HOAc). This reaction generates acetylene cuprous intermediate, which is oxidized to obtain alkynyl radicals, providing an efficient pathway for the synthesis of complex molecules containing alkynyl structures, such as drug intermediates and functional materials.
2. Carbon anion oxidative coupling
In the presence of pyridine, α - sulfonyllithium carbon anions can be oxidized to α -, β - unsaturated sulfone compounds, while catalyzing coupling reactions of carbon anions such as β - lactams, providing a new strategy for the synthesis of heterocyclic compounds (such as antibiotic intermediates).
3. Direct oxidation of C-H bond
Can catalyze the ortho hydroxylation or acetylation reaction of phenol. In the presence of oxygen and morpholine, phenol is oxidized to ortho hydroxyphenol; When isolated from oxygen, ortho acetophenol is generated. This type of reaction avoids the substrate pre functionalization step in traditional methods, significantly improving synthesis efficiency.
4. Olefin cyclopropargylation reaction
By binding with chiral imine ligands, asymmetric cyclopropargylation of olefins with diazoacetic esters can be induced, resulting in the formation of optically active cyclopropane derivatives. This reaction is used in drug synthesis to construct specific chiral frameworks (such as antidepressant intermediates).
5. Si-C bond cleavage reaction
Under the atmosphere of methanol and oxygen, it can promote the cleavage of Si-C bonds in vinyl groups and generate vinyl ether compounds. This reaction has high stereoselectivity and completely yields trans enol ethers; In the presence of water, aldehydes are generated, providing a green method for synthesizing oxygen-containing heterocyclic compounds.
Agricultural Applications: A Multi faceted Approach to Plant Protection and Growth
1. Regulation
In the field of agriculture, it has the functions of sterilization, preservation, and plant growth regulation, and is an important auxiliary agent for green agriculture
broad-spectrum fungicide
It has significant effects on cucumber bacterial leaf spot disease, eggplant red spot disease, apple tree rot disease, grape downy mildew, etc. Its mechanism of action is to destroy the cell membrane structure of pathogenic bacteria and inhibit spore germination. Compared with traditional fungicides, it has the advantages of low toxicity and low residue, which meets the requirements of modern agriculture for environmental protection.
2. Plant specimen preservative
Copper acetate solution can replace magnesium ions in chlorophyll, generating more stable copper substituted chlorophyll and keeping plant specimens bright green. A saturated copper acetate solution prepared with 50% acetic acid solution is commonly used to impregnate specimens (which can be heated during processing). This method is widely used in the production of plant specimens in museums and research institutions.
3. Seed treatment agent
Soaking seeds in low concentration copper acetate solution can increase germination rate and enhance seedling disease resistance. The mechanism is to activate the endogenous antioxidant enzyme system in seeds and reduce the damage of free radicals to cells.
Materials Science: Synthesis and Modification of Functional Materials
The application in the field of materials involves multiple sub industries such as pigments, ceramics, and electroplating, and is a key additive for improving material performance
1. Ceramic coloring agent
Copper (II) acetate is the main component of blue ceramic glaze, and its coloring mechanism is the formation of stable cuprous oxide (Cu ₂ O) crystals by copper ions at high temperatures, presenting a unique sky blue color. By adjusting the amount of copper acetate added, the color tone of the glaze can be controlled from light blue to deep blue.
2. Electroplating solution additive
Copper acetate, as an additive in copper electroplating solution, can improve the uniformity and density of the coating. Its electrochemical properties allow copper ions to preferentially deposit on the surface of the substrate during electrolysis, forming a copper coating with excellent conductivity and strong corrosion resistance, which is widely used in surface treatment of electronic components such as printed circuit boards.
3. Pigment Intermediates
Copper acetate is an intermediate used in the preparation of Paris green (copper arsenite acetate), which has been used as an oil painting pigment and insecticide. Although Paris Green has gradually been phased out due to toxicity issues, copper acetate still plays an important role in the synthesis of new environmentally friendly pigments such as copper phthalocyanine.
Analytical Chemistry: The Dual Role of Reagents and Standard Substances
Copper acetate serves as both a reagent and a standard substance in the field of analysis, and is an important tool for quality control and scientific research testing
1. Chromatographic analysis reagents
Copper acetate, as a mobile phase additive, can improve the separation efficiency of polar compounds in liquid chromatography (HPLC). The copper ion forms a complex with the target molecule, and selective separation is achieved by adjusting the stability of the complex.
2. Precipitating reagent
In inorganic analysis, copper acetate can be used to determine sulfur ions (S ² ⁻) and sulfides. The reaction principle is that copper ions and sulfur ions form black copper sulfide (CuS) precipitation, and the sulfur content can be quantitatively calculated by the precipitation mass.
3. Reference material
High purity copper acetate (content ≥ 98%) is used as a standard substance for calibrating analytical instruments (such as atomic absorption spectrometers) and verifying the accuracy of analytical methods. Its stable chemical properties and clear composition make it an ideal standard reference.
Exploration of potential therapeutic agents in the fields of medicine and biology
Although the pharmaceutical applications of copper acetate are still in the research stage, its anti-tumor activity and antibacterial properties have attracted attention:
1. Antitumor activity
In vitro experiments have shown that copper acetate has a significant inhibitory effect on the growth of liver cancer cells, and its mechanism may involve inducing cell apoptosis and inhibiting angiogenesis. However, due to the potential toxicity of copper ions, their clinical application requires further evaluation of safety.
2. Antimicrobial agent
Copper acetate has inhibitory effects on various bacteria (such as Escherichia coli, Staphylococcus aureus) and fungi (such as Candida albicans). Its antibacterial mechanism involves disrupting the integrity of the cell membrane, leading to leakage of cellular contents. Low concentration copper acetate solution can be used for disinfection treatment of medical devices.
The unique properties of copper acetate enable it to demonstrate potential applications in specific fields
1. Restauro
Copper (II) acetate solution is used to clean copper rust (alkaline copper carbonate) on the surface of bronze ware. The reaction principle is that copper ions combine with carbonate ions in copper rust to form soluble copper acetate complexes, thereby restoring the original appearance of cultural relics.
2. Energy materials
Copper acetate is used as a precursor for copper source in the synthesis of negative electrode materials for lithium-ion batteries, such as copper oxide nanoparticles.
Its uniform particle size distribution and high purity can improve the cycling stability and charge discharge efficiency of the battery.
3. Printing and dyeing fixing agent
Copper acetate forms a complex with dye molecules, which can improve the adhesion and washability of dyes on fibers. Its fixing effect is superior to traditional aluminum salt fixing agents, especially suitable for dyeing natural fibers such as cotton and hemp.
Various synthetic methods of copper acetate , including chemical synthesis, solvent evaporation and biosynthesis.
Chemical synthesis method
● Reaction of acetic acid and copper oxide:
CuO + 2CH3COOH -> Cu(CH3COO)2 + H2O
This is the most basic method of preparing Copper(II) acetate, which only needs to mix acetic acid and copper oxide and heat the reaction. This reaction is widely used due to its easy reproducibility and low cost. The product can be dissolved in water or alcohol.
● Reaction under base catalysis:
In the presence of a base, acetic acid and copper oxide react faster and require less heating to reach the reaction conditions.
CuO + 2CH3COOH + 2NaOH -> Cu(CH3COO)2 + 2NaOH + H2O
This method is easy to operate and reproducible, but if the excess base and acetic acid are not removed, it will lead to the generation of colored impurities and affect the purity of the product.
● Ion exchange method:
This method is suitable for the separation of Copper(II) acetate from solutions containing Copper(II) ions. In this method, a chelating agent is usually used to adsorb Copper(II) ions, followed by strong acid elution to obtain pure Copper(II) acetate.
● Mild reduction reaction:
Copper(II) acetate prepared by hydrogen reduction of copper salt is usually carried out in the Bird's Nest reactor. Mix CuO and acetic acid, put into a hydrogen reactor and feed hydrogen, react at 67°C under constant pressure, and the product is high-purity Copper(II) acetate.
Solvent evaporation method
Copper(II) acetate can also be prepared by solvent evaporation. In this method, copper ions are mixed with acetic acid complexes, and then evaporated at low temperature to obtain Copper(II) acetate. This process can be achieved by evaporators and vacuum dryers.
The main advantages of this method are high product yield, low cost, and easy scale-up. The product can be dissolved in water or organic solvent.
Biosynthesis method
The biosynthesis method of copper (II) acetate utilizes metabolites produced by microorganisms to synthesize Copper(II) acetate by increasing copper ions. Its production process is mainly divided into fermentation, grafting, extraction and other links.
At present, many microorganisms have been found to use waste materials such as chemical fiber pollutants, fine organic chemicals, and residual pesticides to produce biomass and fillers, catalyze the synthesis of organic synthetic chemicals, and achieve efficient remediation of organic matter.
Among the above methods, the chemical synthesis is convenient and low in cost, but there are still some problems, such as the low purity of the Copper(II) acetate product, environmental pollution and the like. The solvent evaporation method can improve the purity of the product, but it takes a long time and the cost is relatively high. The biosynthesis method is green and environmentally friendly, but requires relatively high technical requirements. Comprehensive consideration, in practical application, the choice of production method should be considered according to the specific application requirements and cost.
Copper (II) acetate is a multifaceted compound with a rich history and diverse applications across chemistry, industry, and art. Its unique properties, such as solubility, redox activity, and coordination chemistry, underpin its utility in synthesis, catalysis, and material science. However, its toxicity demands stringent safety protocols and environmental stewardship. As industries strive for sustainability, innovations in copper acetate utilization and waste management will play a pivotal role in minimizing ecological impact while maximizing benefits. By adhering to safety guidelines and exploring greener alternatives, researchers and professionals can continue to harness the advantages of copper (II) acetate in a responsible and forward-thinking manner.
Frequently Asked Questions
Is Cu(C2H3O2)2 soluble in water?
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Physical and Chemical Properties
Soluble in water, ethanol. Slightly soluble in ether, glycerol.
Is copper acetate the same as verdigris?
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Technically, true verdigris is the copper acetate salt, either neutral or basic, and is a bright green-blue color.
Is copper II acetate safe to use?
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A skin irritant; May cause severe eye injury; Inhalation of dust causes throat and lung irritation; Chronic exposure in dogs causes liver degeneration; [CHRIS] Acute copper poisoning after ingestion can cause liver injury, methemoglobinemia, and hemolytic anemia.
Can you touch copper acetate?
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Avoid contact with skin, eyes and clothes. Do not breathe dust. Keep away from drains, surface and ground water.
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