Hexacarbonyltungsten are important organometallic compounds, which are coordination compounds formed by transition metal tungsten (molybdenum) and carbon monoxide ligands, usually six ligands, and are widely used in organic synthesis. For example, under light conditions, molybdenum Hexacarbonyltungsten can be used to catalyze the ring-opening polymerization of cycloalkenes; carbonyl tungsten or carbonyl molybdenum complexes can undergo corresponding insertion reactions with alkenes, fast Hexacarbonyltungsten, diazomethane, cyanide, etc. to generate various organic compounds. Molybdenum compounds; simple substituted organo-molybdenum compounds can be prepared by using the ligands of carbonyl tungsten or carbonyl molybdenum complexes to carry out intermolecular substitution or exchange reactions, and more complex binuclear complexes can also be prepared.
Hexacarbonyltungsten has the chemical formula W(CO)6. Molecular weight 351.91. White crystals. Specific gravity 2.65. Sublimation at 60～70℃ in vacuum. Slightly decomposes in sunlight. It decomposes rapidly to tungsten and carbon monoxide at about 150°C. Insoluble in water, insoluble in ethanol, ether, benzene, soluble in fuming nitric acid. It is obtained by heating tungsten hexachloride, aluminum powder and carbon monoxide (1.1 × 107 Pa) to 100 °C in an autoclave. Used as a catalyst, it can also be used for tungsten plating on metals or ceramics. Tungsten Hexacarbonyltungsten is a coordination compound through which the first dihydro complex was obtained. It is a colorless solid and, like the carbonyl complexes of the same family, chromium Hexacarbonyltungsten and molybdenum hexacarbonyl, is a volatile and air-stable substance in which the tungsten atom has a valence of zero. The band position, intensity and spectral type of the molecular vibrational spectrum of tungsten Hexacarbonyltungsten are closely related to the chemical structure, spatial geometry, molecular force field and distribution of electron clouds inside the molecule. The fluorescence properties have obvious effects, so the study of its vibrational modes and vibrational spectra is of great significance. Some studies have used the high symmetry of tungsten Hexacarbonyltungsten molecules and combined group theory to analyze the vibrational modes and spectral activities of tungsten hexacarbonyl molecules. By calculation, 13 different vibrational frequencies of molecules, molecular bond lengths, electron cloud distribution and other information were obtained.
