Molybdenum hexafluoride, also known as molybdenum fluoride, is a white massive crystalline with CAS number 7783-77-9. Its physical properties are as follows: molecular formula: MoF6, density 2.55lg / cm3 (liquid, 17.5 ℃), melting point: 17.5 ℃, boiling point: 35 ℃. Its chemical properties are as follows: it will no react with dry air, chlorine and sulfur dioxide, but is sensitive to humid air and after reaction can generate blue molybdenum oxide. In the large amount of water it will dissolve and decompose. In the presence of strong oxidizing agent, at room temperature it can erode various metals (except gold, platinum) and the metal surface will become blue. It will react with alkaline fluoride to form coordination compound M21 [MoF8].
There are three preparation methods for molybdenum hexafluoride: 1) Add molybdenum powder into a platinum tube, then passing through dry fluorine gas, and heating to 60°C; 2) MoF6 crude sample can recover at -5 ~ 5 ℃, and then vacuum distillation; 3)Pass bromine trifluoride on molybdenum powder and heat to 350°C; 4) Pass through fluorine gas to MoCl5 in air environment. However, due to the high temperature requirement of Method 3, high energy consumption, and active chemical properties of bromine trifluoride liquid that is flammable, and can be used as an inert solvent, dissolving molybdenum hexafluoride is not easy to separate, and it is difficult to obtain high purity of molybdenum fluoride. In the fourth method, MoCl2 is also a very active and volatile crystal. It has a chemical effect in gaseous and liquid state, but it is easily decomposed into metallic molybdenum deposits in gaseous state, which is not suitable. Therefore, the first method is the most common one for preparing molybdenum hexafluoride.
Applications: It is mainly used for molybdenum isotopes separation and it can also be used in microelectronics industry for chemical vapor deposition molybdenum or molybdenum silicide to produce low resistance and high melting point interconnects. At the same time, it can also be used as a strong fluorinating agent and film-forming material for ion doping.
Storage: 1)Molybdenum fluoride should be stored in a cool, dry, well-ventilated place. 2)Keep away from fire and heat sources. 3)Keep the container tightly closed. 4)It should be stored separately from combustible materials, alcohols, and edible chemicals, and avoid mixed storage. 5)The storage area should be equipped with leakage emergency treatment equipment and suitable storage materials. The "Five Double" management system for extremely toxic substances should be strictly implemented.
Safety Notes: Hydrogen fluoride, a hydrolysate, has a irritating effect on the eyes, skin, and respiratory mucosa. After inhalation, it can damage the bronchi, alveoli, liver, cranial nervous system, bones and teeth.
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