1. Tantalum pentachloride Basic information
Chemical formula: TaCl₅ English name: Tantalum (V) chloride or Tantalic Chloride Molecular weight: 358.213 CAS number: 7721-01-9 EINECS number: 231-755-6
2. Tantalum pentachloride Physical properties
Appearance: white or light yellow crystalline powder Melting point: 221°C (some data also give a melting point of 216°C, which may be due to slight differences caused by different preparation methods and purity) Boiling point: 242°C Density: 3.68g/cm³ (at 25°C) Solubility: Soluble in absolute alcohol, chloroform, carbon tetrachloride, carbon disulfide, thiophenol and potassium hydroxide, slightly soluble in ethanol, insoluble in sulfuric acid (but some data indicate that it can soluble in sulfuric acid). The solubility in aromatic hydrocarbons increases according to the trend of benzene < toluene < m-xylene < mesitylene, and the color of the solution deepens from light yellow to orange.
3. Tantalum pentachloride Chemical properties
Stability: The chemical properties are not very stable and will decompose and generate tantalic acid in humid air or water. Structure: Tantalum pentachloride is a dimer in the solid state, with two tantalum atoms connected by two chlorine bridges. In the gaseous state, tantalum pentachloride is a monomer and exhibits a triangular bipyramidal structure. Reactivity: Tantalum pentachloride is a strong Lewis acid and can react with Lewis bases to form adducts. It can react with a variety of compounds, such as ethers, phosphorus pentachloride, phosphorus oxychloride, tertiary amines, etc.
4. Tantalum pentachloride Preparation method
Reaction of tantalum and chlorine: Tantalum pentachloride can be prepared by reacting powder metal tantalum with chlorine at 170~250°C. This reaction can also be performed using HCl at 400°C. Reaction of tantalum pentoxide and thionyl chloride: At 240°C, tantalum pentachloride can also be obtained by reacting tantalum pentoxide and thionyl chloride.
5. Tantalum pentachloride Application
Chlorinating agent for organic compounds: Tantalum pentachloride can be used as a chlorinating agent for organic compounds to promote chlorination reactions. Chemical intermediates: In the chemical industry, tantalum pentachloride is used as a raw material for the preparation of ultra-high purity tantalum metal and chemical intermediates. Preparation of tantalum: Metal tantalum can be prepared by hydrogen reduction of tantalum pentachloride. This method involves depositing tantalum from the gas phase on a heated substrate support to produce a dense metal, or reducing tantalum chloride with hydrogen in an ebullating bed to produce spherical tantalum powder. Other applications: Tantalum pentachloride is also used in the preparation of optical glass, intermediates of tantalum carbide, and in the electronics industry as a raw material for the preparation of tantalate and rubidium tantalate. In addition, it is used in the manufacture of dielectrics and is widely used in the preparation of surface polishing deburring and anti-corrosion agents.
6. Tantalum pentachloride Safety information
Hazard Description: Tantalum pentachloride is corrosive, harmful if swallowed, and can cause severe burns. Safety Terms: S26: After eye contact, rinse immediately with plenty of water and seek medical advice. S36/37/39: Wear appropriate protective clothing, gloves and eye/face protection. S45: In the event of an accident or if you feel unwell, seek medical advice immediately (show the label if possible). Risk terms: R22: Harmful if swallowed. R34: Causes burns. Storage and transportation: Tantalum pentachloride should be stored in a sealed container to avoid contact with moist air or water. During storage and transportation, the warehouse should be kept ventilated, low-temperature, and dry, and avoid being stored separately from oxidants, cyanides, etc.
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