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Indium chloride tetrahydrate, organic intermediate material, white solid powder, which is heated in air to decompose into In2O3. It is an effective catalyst for C-C bond formation, aldehyde reaction, and reduction in aqueous solution. An efficient and mild Lewis acid is used in organic synthesis. The product is highly toxic, and high heat produces toxic chloride smoke. When stored, the warehouse is ventilated and dry at low temperatures. It shall be stored separately from oxidants, acids, etc. and mixed storage shall not be allowed. Explosion-proof lighting and ventilation facilities shall be adopted. It is forbidden to use mechanical equipment and tools that are easy to produce sparks. The storage area shall be equipped with appropriate materials to contain leakage.
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Basic Properties of Indium Chloride Tetrahydrate
Indium Chloride Tetrahydrate, with the chemical formula InCl₃·4H₂O, is a white crystal with high water solubility. It is stable at room temperature but is hygroscopic, so it needs to be stored in a dry environment. As a Lewis acid, Indium Chloride Tetrahydrate exhibits mild acidity and good catalytic activity in organic synthesis, and can facilitate the progress of various chemical reactions.
Catalytic Applications in Organic Synthesis
C-C Bond Formation Reactions
Indium Chloride Tetrahydrate, when used as a catalyst in aqueous solution, can efficiently facilitate the formation of C-C bonds. For instance, in aldehyde reactions, it can catalyze the addition reaction between aldehydes and alkenes, generating products such as β-hydroxy aldehydes or β-hydroxy ketones. These reactions are of great significance in organic synthesis, as they can construct complex molecular frameworks and provide key intermediates for drug synthesis and natural product preparation.
Friedel-Crafts Acylation Reaction
The Friedel-Crafts acylation reaction is a significant type of functionalization reaction for aromatic compounds. By introducing acyl groups, it can alter the physical and chemical properties of aromatic compounds. Indium Chloride Tetrahydrate, as a Lewis acid catalyst, can effectively facilitate the Friedel-Crafts acylation reaction, enhancing the selectivity and yield of the reaction. This characteristic makes it widely applicable in the synthesis of fine chemicals such as dyes, flavors, and drugs.
Reduction Reaction
Tetrahydrate of Indium Chloride can also act as a catalyst in reduction reactions, facilitating the reduction process of certain organic compounds. For instance, in the reduction reaction of ketones, it can catalyze the reaction between ketones and hydrides, generating corresponding alcohol products. Such reactions are also of great significance in organic synthesis, providing key steps for the construction of complex molecules.
Stereoselective Synthesis
Indium Chloride Tetrahydrate also demonstrates excellent performance in stereoselective synthesis. For instance, when synthesizing highly substituted 4-piperidones through a dual Mannich reaction, Indium Chloride Tetrahydrate, as a catalyst, can significantly enhance the stereoselectivity of the reaction, generating products with specific configurations. This characteristic makes it highly applicable in drug synthesis, providing crucial synthetic steps for drug molecules with specific biological activities.
Applications in Semiconductor Manufacturing
Preparation of Indium-Based Semiconductor Materials
Indium Chloride Tetrahydrate is an important precursor for preparing indium-based semiconductor materials. Indium-based semiconductor materials, such as indium phosphide (InP) and indium arsenide (InAs), are widely used in optoelectronic devices, high-speed electronic devices, and solar cells. Through methods such as thermal decomposition or chemical vapor deposition, Indium Chloride Tetrahydrate can be converted into corresponding indium-based semiconductor materials, providing key raw materials for the manufacturing of these devices.
Preparation of Indium Oxide Thin Films
Indium oxide (In₂O₃) films are an important type of transparent conductive material, widely used in touch screens, displays, and solar cells, among other applications. Indium Chloride Tetrahydrate serves as the precursor and can be synthesized into indium oxide films through methods such as sol-gel method and spray pyrolysis. These methods have the advantages of simple process, low cost, and ease of large-scale production, which can meet the requirements of modern electronic devices for transparent conductive materials.
Preparation of Indium Sulfide Thin Films
Indium sulfide (In₂S₃) films play a crucial role as a buffer layer in inverted organic photovoltaic cells. Indium Chloride Tetrahydrate can be prepared as indium sulfide films through methods such as chemical bath deposition, providing key support for the performance improvement of photovoltaic cells. The introduction of indium sulfide films can enhance the photoelectric conversion efficiency of photovoltaic cells, improve their stability and service life.
Applications in Thin Film Technology
Preparation of Indium Tin Oxide (ITO) Thin Films
Indium Tin Oxide (ITO) thin films are an important type of transparent conductive oxide film, widely used in touch screens, displays, solar cells, gas sensor devices, and other fields. Indium Chloride Tetrahydrate serves as the indium source and can be prepared into ITO films through methods such as magnetron sputtering and electron beam evaporation. These methods have the advantages of mature preparation processes and high film quality, which can meet the high-performance requirements of modern electronic devices for transparent conductive materials.
Preparation of Nano Composite Materials
Indium Chloride Tetrahydrate can also serve as a precursor for preparing nano composite materials with photocatalytic activity. For instance, by reacting with zinc salts and copper salts, ZnO/CuInS₂ nano composite materials can be synthesized. These nano composite materials have broad application prospects in areas such as photocatalytic degradation of organic pollutants and photocatalytic hydrogen production. The introduction of Indium Chloride Tetrahydrate can improve the crystal structure and surface properties of the nano composite materials, enhancing their photocatalytic activity and stability.
Other Applications in Materials Science Research
In-depth Study of Lewis Acid Catalysts
With the continuous development of organic synthesis chemistry, the demand for Lewis acid catalysts is increasing day by day. Indium Chloride Tetrahydrate, as a mild and efficient Lewis acid catalyst, has received extensive attention in materials science research. Researchers have continuously developed new catalytic reactions and catalytic systems through in-depth studies of its catalytic mechanism, providing new impetus for the development of organic synthesis chemistry.
Application in the Development of New Electronic Devices
With the continuous emergence of new electronic devices, the requirements for material properties have also become increasingly higher. Indium Chloride Tetrahydrate, as an important inorganic compound, has potential application value in the development of new electronic devices. For instance, in the fields of flexible electronic devices, transparent electronic devices, and spin electronic devices, Indium Chloride Tetrahydrate and its derivatives may serve as key materials, providing new solutions for improving the performance of these devices.
Usage Precautions and Safety Guidelines
Storage Conditions
Indium Chloride Tetrahydrate is hygroscopic, so it should be stored in a dry and sealed environment. Avoid contact with humid air to prevent it from absorbing moisture and forming lumps or deteriorating. At the same time, it should be stored in a cool place, avoiding direct sunlight and high-temperature conditions.
Operating Specifications
When operating Indium Chloride Tetrahydrate, appropriate personal protective equipment such as laboratory coats, gloves, and goggles should be worn. Avoid direct contact with skin and eyes to prevent irritation and corrosion. During weighing, dissolving, and transfer operations, use dry and clean instruments and equipment to prevent cross-contamination and the introduction of impurities.
Waste Disposal
The used Indium Chloride Tetrahydrate waste should be disposed of in accordance with relevant environmental protection regulations. Avoid dumping or discharging it randomly to prevent pollution to the environment. The waste can be collected and handed over to professional waste disposal institutions for processing.
Indium Chloride Tetrahydrate is a white crystal with unique and diverse chemical properties. It demonstrates significant application value in various fields. The following will elaborate on its basic chemical characteristics, solubility, hydrolysis, Lewis acidity, redox properties, and thermal stability.
Basic chemical properties
Trichloroindium tetrahydrate is composed of indium, chlorine and water molecules, with the chemical formula InCl₃·4H₂O. It belongs to the category of inorganic salts and has a definite crystal structure. At room temperature, this compound exists in the form of white powder or crystals, with a high degree of purity. It can usually be obtained through chemical synthesis methods.
Solubility
The tetra-hydrated indium trichloride is well soluble in water and can dissolve rapidly to form a transparent solution. This property enables it to act as a reactant or catalyst in many chemical reactions, allowing for convenient mixing and reaction. Additionally, it is soluble in certain organic solvents, such as alcohols, but the solubility may vary depending on the type of solvent and temperature.
Hydrolysis
In an aqueous solution, the tetra-hydrated indium trichloride will undergo a certain degree of hydrolysis reaction. During the hydrolysis process, the indium ions (In³⁺) combine with water molecules to form hydrated indium ions, and may release a small amount of hydrogen chloride (HCl). The extent of the hydrolysis reaction is influenced by factors such as the pH value of the solution, temperature, and the concentration of indium ions. Under acidic conditions, the hydrolysis reaction may be inhibited; while in alkaline conditions, the hydrolysis reaction may intensify, and even lead to the formation of precipitates.
Lewis acidity
The indium ions (In³⁺) in the tetra-hydrated indium trichloride exhibit empty orbitals and can accept electron pairs, thus demonstrating Lewis acidity. This acidity enables it to act as a catalyst, facilitating various organic chemical reactions. For instance, in the addition reaction between aldehydes and alkenes, indium trichloride tetra-hydrate can catalyze the addition of the carbonyl carbon of the aldehyde to the double bond of the alkene, generating products such as β-hydroxy aldehydes or β-hydroxy ketones. Moreover, it can also catalyze Friedel-Crafts acylation reactions, reduction reactions, etc., improving the selectivity and yield of the reactions.
Redox properties
The indium element in indium trichloride tetrahydrate typically exists in a +3 oxidation state, which is its most stable oxidation state. Under normal circumstances, indium trichloride tetrahydrate is not easily reducible or oxidized. However, under specific conditions, such as the presence of strong reducing agents or strong oxidizing agents, the oxidation state of indium may change. For example, in the presence of a strong reducing agent, indium ions may be reduced to lower-valent indium compounds; while in the presence of a strong oxidizing agent, indium may be oxidized to a higher-valent compound (although this situation is relatively rare).
Thermal stability
The tetra-hydrated indium trichloride may undergo decomposition under heating conditions. As the temperature rises, the water molecules in the hydrate gradually lose their binding, causing the compound to transform into anhydrous indium trichloride (InCl₃). Further heating of the anhydrous indium trichloride may result in its decomposition into lower-valent compounds of indium chloride or a mixture of indium metal and chlorine gas. Therefore, when using tetra-hydrated indium trichloride, it is necessary to pay attention to controlling the heating temperature and time to avoid its decomposition and deterioration.
FAQ
1. What should be noted when using Indium Chloride Tetrahydrate?
When operating in a professional environment, strictly follow the corresponding technical procedures and safety guidelines based on specific purposes to ensure proper usage.
2. What are the main purposes?
It is mainly applied in the electronics industry and is an important precursor for preparing indium-based semiconductor materials and ITO target materials; it is also used as a catalyst in organic synthesis and a laboratory indium source reagent.
3. What should be noted when storing?
It should be stored in a sealed manner in a cool, dry and well-ventilated place, and avoid contact with oxidants or active metals. It is recommended to operate and store it in strict accordance with the chemical management regulations.
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