Tungsten Hexacarbonyl

Tungsten Hexacarbonyl Basic Properties

• Appearance: Pale yellow to beige fine crystalline powder

• Molecular Weight: 364

• Melting Point: 150 °C(lit.)

• Boiling Point: 175 °C

• Density: 2.65 g/mL at 25 °C(lit.)

• Vapour Pressure: 1.2 mm Hg ( 67 °C)

• Flash Point: 200°C

• Solubility: Insoluble in water, soluble in organic solvents

• Storage Conditions: Store below +30°C

Tungsten Hexacarbonyl Key Features

High-purity tungsten source

Tungsten hexacarbonyl can be efficiently purified through sublimation under moderate heating, yielding products with a purity of over 99.9%. This characteristic makes it particularly suitable for semiconductor and thin-film deposition processes with extremely high purity requirements, ensuring that the impurity content in the final product is minimized.

Ideal tungsten source material

W(CO)₆ is an important precursor for the preparation of high-purity tungsten thin films and tungsten nanomaterials, and can be used to manufacture semiconductors, solar cells and microelectronic components.

Excellent volatility

This compound readily sublimates at low temperatures and can be uniformly evaporated under vacuum conditions, making it ideal for CVD and ALD processes.

Controllability of thermal decomposition

The thermal decomposition process of W(CO)₆ is relatively mild and easy to control. By precisely controlling the decomposition conditions, tungsten materials with different morphologies and crystal forms can be obtained to meet diverse application requirements.

Tungsten Hexacarbonyl Main Applications

Semiconductor thin film deposition

In semiconductor manufacturing, tungsten hexacarbonyl is deposited on silicon wafers using a CVD process to form thin films of tungsten, which are used as barrier layers and filler materials for interconnects. It is widely used in high-end electronic devices such as transistors, integrated circuits, and memory chips.

Catalysis research and applications

As an important raw material for organometallic compounds, W(CO)₆ is used as a catalyst or catalytic precursor in a variety of catalytic reactions, including olefin carbonylation and hydrogenation reactions.

Materials science

In the field of scientific research, this compound is often used to study the bonding properties, photochemical behavior, and synthesis of derivatives of metal carbonyl complexes.

Nanomaterial synthesis

Tungsten hexacarbonyl is a key raw material for the preparation of tungsten nanoparticles and coating materials, which helps to improve the hardness, corrosion resistance, and electrical conductivity of these materials. These materials have important applications in catalysis, sensors, and energy storage.

Precautions

1. Tungsten hexacarbonyl is moderately toxic, and appropriate personal protective equipment, including gas masks, chemical safety goggles, and chemical-resistant gloves, must be worn when handling it.

2. All operations should be carried out in a well-ventilated chemical fume hood to avoid direct contact and inhalation.

3. It should be stored in a cool, well-ventilated, and dry place, away from heat sources and sunlight. This compound is insoluble in water, but moisture may affect its purity and reactivity; therefore, the container should be kept dry.

4. If there is any overflow, cover it with an inert absorbent (such as dry sand), collect it and seal it. Do not discharge it directly into the sewer.

FAQ

1. Does W(CO)₆ turning yellow during storage mean it has failed?

Yellowing usually indicates that the product has begun to decompose, possibly due to exposure to air, light, or high temperatures. Slight discoloration may not affect some applications, but for demanding applications such as semiconductor deposition, it is recommended to repurify or use a new batch to ensure process stability.

2. Is tungsten hexacarbonyl toxic?

Yes, it decomposes when heated to produce toxic carbon monoxide gas. Handling must be done in a well-ventilated environment with protective equipment.

3. Can it be used as a substitute for other metal carbonyl groups?

It can be used in some applications, such as studying the electronic structure of carbonyl complexes, but its unique chemical properties require determination of its feasibility based on experimental needs.

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