Chromium carbonyl (Cr(CO)6)
hexacarbonylchromium
CAS: 13007-92-6
Molecular Formula: 6CO.Cr
Chromium carbonyl (Cr(CO)6) - Names and Identifiers
| Name | hexacarbonylchromium |
| Synonyms | Chromcarbonyl hexacarbonylchromium ChroMiuM(0)hexacarbo Chromium(0) hexacarbonyl Chromiumcarbonyl(Cr(CO)6) (OC-6-11)-Chromiumcarbonyl Chromium carbonyl (Cr(CO)6) (oc-6-11)-chromiumcarbonyl(cr(co)6 Chromiumcarbonyl(Cr(CO)6),(OC-6-11)- Chromium carbonyl (cr(co)6), (oc-6-11)- |
| CAS | 13007-92-6 |
| EINECS | 235-852-4 |
| InChI | InChI=1/6CO.Cr/c6*1-2;/rC6CrO6/c8-1-7(2-9,3-10,4-11,5-12)6-13 |
Chromium carbonyl (Cr(CO)6) - Physico-chemical Properties
| Molecular Formula | 6CO.Cr |
| Molar Mass | 220.06 |
| Density | 1.77 g/mL at 25 °C (lit.) |
| Melting Point | >150 °C (dec.) (lit.) |
| Boling Point | 220 °C |
| Water Solubility | insoluble |
| Vapor Presure | 1 mm Hg ( 36 °C) |
| Vapor Density | 7.6 (vs air) |
| Appearance | Crystals |
| Specific Gravity | 1.77 |
| Color | White |
| Exposure Limit | TLV-TWA: 0.05 mg (Cr)/m3, confirmedhuman carcinogen (ACGIH)PEL: 0.1 mg (CrO3)/m3 (ceiling) (OSHA). |
| Merck | 13,2253 |
| Storage Condition | Store below +30°C. |
| Stability | Stable. Incompatible with strong oxidizing agents. |
| Sensitive | Light Sensitive/Heat Sensitive |
Chromium carbonyl (Cr(CO)6) - Risk and Safety
| Risk Codes | R22 - Harmful if swallowed R50/53 - Very toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment. R49 - May cause cancer by inhalation R44 - Risk of explosion if heated under confinement R43 - May cause sensitization by skin contact R20/21/22 - Harmful by inhalation, in contact with skin and if swallowed. R5 - Heating may cause an explosion |
| Safety Description | S53 - Avoid exposure - obtain special instructions before use. S36 - Wear suitable protective clothing. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) S61 - Avoid release to the environment. Refer to special instructions / safety data sheets. S60 - This material and its container must be disposed of as hazardous waste. S36/37 - Wear suitable protective clothing and gloves. |
| UN IDs | UN 3466 6.1/PG 3 |
| WGK Germany | 3 |
| RTECS | GB5075000 |
| TSCA | Yes |
| HS Code | 29310095 |
| Hazard Class | 6.1 |
| Packing Group | II |
| Toxicity | LD50 i.v. in mice: 100 mg/kg (Strohmeier) |
Chromium carbonyl (Cr(CO)6) - Reference Information
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| introduction | chromium hexacarbonyl white crystal. Stable in air, but volatile. Insoluble in water, methanol, ethanol, slightly soluble in iodoform, carbon tetrachloride, slightly soluble in tetrahydrofuran. It does not interact with hydrochloric acid, is slowly eroded by sulfuric acid, and is easily decomposed by nitric acid. When interacting with alkenes, alkynes, aromatics, phosphines, amines, etc., the carbonyl group is replaced to form a series of derivatives. |
| Structural characteristics | Chromium hexacarbonyl is a coordination compound. It is a solid at room temperature and has a high vapor pressure. It is easy to sublimate. The valence of the chromium atom in chromium hexacarbonyl is zero. It is a homogeneous compound. All carbonyl groups are equivalent. Its structure is octahedral, the bond lengths of Cr-C and C- O are 1.91 and 1.14 Å respectively. Chromium hexacarbonyl is used as a catalyst for olefin polymerization and isomerization, a gasoline additive, and a raw material for the preparation of chromium monoxide. |
| preparation | preparation under normal pressure. In a good fume hood, a 3-liter five-neck flask equipped with a high-speed metal (steel gold-plated) agitator, a dry ice-acetone condenser, a carbon monoxide intake pipe, a thermometer and a burette for phenylmagnesium bromide In the flask, place 12 grams of anhydrous chromium trichloride and 700 milliliters of dry ether, under intense stirring at -70°C, 210 milliliters of 2.7N phenylmagnesium australide are added dropwise for 1 hour. After the dripping, replace the dry ice bath with an ice water bath, and quickly pass into a city of carbon. The reaction appears dark color at about 10 ℃, which can be regarded as the beginning of the reaction. The reaction was continued at a low temperature of 0°C for 15-30 minutes, the reaction mixture was poured into ice water containing 100 ml · 6N sulfuric acid, and then separated according to the method described in the above high pressure method to obtain 1.8 grams (11%) of carbon compound. In the presence of dry nitrogen/zhang, 470 ml of diethylene glycol dimethyl ether and 80 ml of sodium sand (1.20g atoms)-liquid stone vinegar suspension (40%) were added in a 1-liter Parr autoclave equipped with a blade stirrer. After the autoclave was cooled to a 20 ℃ in a dry ice bath, 31.7g (0.20 mol) of anhydrous chromium trichloride powder was added in the presence of nitrogen. Closed, placed in an ice salt bath, and introduced carbon monoxide under stirring to make the air pressure reach 56.2kg/cm. After 1.5 hours of reaction, the air pressure dropped to 47.8kg/cm2 (indicating carbon monoxide absorption), and the reaction temperature rose to -5 ℃. At this temperature, carbon monoxide is absorbed slowly. After 30 minutes, sprinkle ice and a salt bath, let the temperature rise to room temperature (30 ℃), and the air pressure in the kettle body can rise to 56.2kg/cm. At this time, you can continue to stir for 16 hours. In a high-pressure vessel with a high-pressure mirror, a solution of 22.2 ml (0.40 about mol) of concentrated sulfuric acid and 228 ml of oxygen-free water is placed, and then the solution is pressed into the reaction mixture in the presence of carbon monoxide at -5-0 ℃ with the help of 70.33kg/cm' nitrogen pressure at -5-0 ℃ for 2 hours. Due to the exothermic reaction, the temperature in the kettle can rise to room temperature at a later stage. Depressurization, transfer the mixed solution to a 2-liter three-neck flask, add 100 ml of water and 100 ml of concentrated hydrochloric acid. Under stirring, the number of compounds are co-distilled with water to obtain 35.2 grams (80%) of the pure product chromium hexacarbonyl. |
Last Update：2024-04-10 22:29:15
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