Like chromium hexacarbonyl (Cr(CO)6) and molybdenum hexacarbonyl (Mo(CO)6), tungsten hexacarbonyl (W(CO)6) is also a coordination compound of the sixth subgroup in the chemical element cycle, It is also a homogeneous compound, all carbonyl groups are equivalent, and the crystal structure is octahedral, so they have similar physical and chemical properties, production methods and uses. Note: The valences of tungsten, chromium and molybdenum atoms in W(CO)6, Cr(CO)6 and Mo(CO)6 are all zero. The following will introduce the basic information of W(CO)6.
From the perspective of chemical composition, W(CO)6 is an organometallic compound composed of three elements: tungsten, carbon and oxygen. It is a coordination compound formed by tungsten and carbon monoxide ligands. The English name is hexacarbonyl tungsten, and its chemical formula is (W(CO)6), the molecular weight is 351.9.
From the perspective of physical and chemical properties, W(CO)6 is a colorless, odorless and irritating solid with a density of 2.65g/cm3, a melting point of 172-174°C, and a sublimation temperature of 50°C. At 150°C, it will decompose into tungsten and Carbon monoxide is insoluble in water, hardly soluble in ethanol, ether and benzene, soluble in fuming nitric acid, and has volatility and catalytic properties.
From the point of view of the production method, the preparation steps of W(CO)6 include: first place tungsten hexachloride, anhydrous ether and reducing agent (carbonyl iron powder and pentacarbonyl iron complex mixture) in the reaction kettle, and then Charge and release carbon monoxide and raise the temperature to 25°C-50°C, then stir evenly, cool down and take out the solution after the reaction, and finally obtain the product through distillation and heating sublimation.
In terms of usage, tungsten hexacarbonyl can be used to catalyze the ring-opening polymerization of cycloalkenes; it can react with unsaturated organic substances such as alkenes, alkynes, and diazomethane to generate various organic tungsten compounds; Tungsten compounds and complex binuclear complexes; can be used in high-purity tungsten powder, catalyst synthesis, etc.
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