SILVER DIFLUORIDE
SILVER(II) FLUORIDE
CAS: 7783-95-1
Molecular Formula: AgF
SILVER DIFLUORIDE - Names and Identifiers
SILVER DIFLUORIDE - Physico-chemical Properties
| Molecular Formula | AgF |
| Molar Mass | 126.87 |
| Density | 4.57 g/mL at 25 °C(lit.) |
| Melting Point | 690 °C(lit.) |
| Boling Point | 700°C |
| Water Solubility | decomposed by H2O [CRC10] |
| Appearance | Brown Crystalline |
| Storage Condition | Keep in dark place,Inert atmosphere,Room temperature |
| Stability | Moisture Sensitive & Hygroscopic |
| Sensitive | Sensitive to humidity and light |
| MDL | MFCD00003410 |
| Physical and Chemical Properties | Soluble in hexane, chloroform, chlorofluorocarbon and hydrogen fluoride. |
| Use | For the preparation of bromoacetylene from large sterically hindered trialkylsilylacetylene. It is also used for palladium-catalyzed cross-coupling reaction of acetanilide and trialkoxysilane. |
SILVER DIFLUORIDE - Risk and Safety
| Risk Codes | R8 - Contact with combustible material may cause fire R14 - Reacts violently with water R23/24/25 - Toxic by inhalation, in contact with skin and if swallowed. R34 - Causes burns |
| Safety Description | S17 - Keep away from combustible material. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 1759 8/PG 2 |
| WGK Germany | 3 |
| RTECS | VW4200000 |
| FLUKA BRAND F CODES | 3-8-10 |
| HS Code | 28432900 |
| Hazard Class | 5.1 |
| Packing Group | III |
SILVER DIFLUORIDE - Production method
1. dry silver chloride at 110 ℃ for one day and night, and pulverize it to below 30 mesh, then spread it thin in a reaction dish, put it into a reaction tube, and react with fluorine gas at 200 ℃. when chlorine gas is not detected in the exhaust gas, then pass fluorine gas for 3 hours. The whole process should be carried out in a drying oven, and the resulting product should be stored in a metal tank. In order to prevent the three-component mixture of AgCl,AgF2 and AgF from melting, the reaction temperature should be controlled below 80 ℃ at the initial stage of the reaction, and then slowly increased to 200~250 ℃.
2. slowly add concentrated ammonia water with a relative density of 0.898 to 2mol/L silver nitrate solution, stir to form a transparent solution, then add formaldehyde aqueous solution to the above solution under stirring conditions, and place the reaction mixture for 1h, filter out the precipitated silver, wash with water, then wash with ethanol and ether, and dry at 110 ℃. The yellow-brown product can be obtained by reacting the silver powder prepared by the above method with fluorine at room temperature, but it should be noted that the reaction temperature should not be higher than 60 ℃. At the end of the reaction, gradually increase the temperature to 250°C to obtain silver difluoride. When using fluorine gas as a reactant to synthesize silver difluoride, attention should be paid to the treatment of fluorine gas in the tail gas.
3. Drying 50 grams of newly precipitated silver chloride at 1IQ °C overnight, grind fine to pass through a 30-hole sieve. Then spread it into a thin layer on the reaction plate. The reaction disc was installed in the reactor and subjected to fluorine at a furnace temperature of 200°C. The fluorine is passed through the raw material in the reaction plate until no trace of chlorine is detected in the released gas, and then the fluorine is continuously passed for 3 hours, and the fluorine is purged with dry nitrogen to discharge. Wash and dry a metal can with a fastened lid, and remove the air from the can with dry nitrogen. Then take out the product, move the product into the metal tank within 1-3 seconds, and then close the container.
Last Update：2024-04-10 22:29:15
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CAS: 7783-95-1
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Mobile: 18021002903
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