Strontium iodide
strontium iodide
CAS: 10476-86-5
Molecular Formula: I2Sr
Strontium iodide - Names and Identifiers
| Name | strontium iodide |
| Synonyms | SrI2 STRONTIUM IODIDE Strontium iodide strontium iodide strontium diiodide STRONTIUM (II) IODIDE strontiumiodide(sri2) Strontium iodide (SrI2) Strontiumiodide,hexahydrate |
| CAS | 10476-86-5 |
| EINECS | 233-972-1 |
| InChI | InChI=1/2HI.Sr/h2*1H;/q;;+2/p-2 |
Strontium iodide - Physico-chemical Properties
| Molecular Formula | I2Sr |
| Molar Mass | 341.43 |
| Density | 4.55 g/mL at 25 °C (lit.) |
| Melting Point | 515 °C (lit.) |
| Boling Point | 1773 °C/1 atm (lit.) |
| Water Solubility | Soluble in water and ethanol. |
| Appearance | beads |
| Specific Gravity | 4.55 |
| Color | White to pale yellow |
| Merck | 14,8844 |
| Storage Condition | Room Temprature |
| Sensitive | Hygroscopic |
| MDL | MFCD00049557 |
| Use | Used as drugs and intermediates |
Strontium iodide - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R14 - Reacts violently with water R34 - Causes burns |
| Safety Description | S22 - Do not breathe dust. S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S27 - Take off immediately all contaminated clothing. 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 3260 8/PG 2 |
| WGK Germany | 3 |
| RTECS | WK9275000 |
| FLUKA BRAND F CODES | 3-8 |
| TSCA | Yes |
Strontium iodide - Reference Information
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Application | Strontium iodide can be used to prepare glass films containing divalent europium ions doped with strontium iodide microcrystals and to prepare a thallium-free metal halide filler for ceramic metal halide lamps. |
| preparation | (1) add 5.4g of deionized water into a 250ml glass beaker, weigh 7.38g of strontium carbonate (SrCO3) raw material with purity of 99.99%, place it in a reaction container, add hydroiodic acid with purity not less than 99.9% drop by drop, and stir it through a magnetic stirrer to completely react strontium carbonate with hydroiodic acid, when the solution is clear and the pH value is 5.5, stop adding hydroiodic acid; (2) by adding a small amount of ammonia water, adjust the pH value of the solution to 7.5, and filter to remove impurities; Stir and heat the obtained strontium iodide aqueous solution at 100 ℃ ± 2 ℃, and when the solution is concentrated to the initial capacity of 2/5, stop heating and put the glass beaker into the ice immediately, the temperature of the solution in the beaker is quickly reduced to 2-3°C, and a large number of flaky crystals are precipitated out in the solution; (3) The crystals and the mother liquor are separated by vacuum suction and filtration to obtain 20.036 grams of aqueous crystals. Re-dissolve these aqueous crystals in 10 grams of water to obtain a purified aqueous solution of strontium iodide; (4) Move the above aqueous solution to a quartz glass boat, then the quartz glass boat is placed in a tube furnace, one side of the tube furnace is connected to a vacuum pump, and the other side is connected to a high-purity nitrogen bottle. First turn on the vacuum pump, pump the vacuum tube to a relative pressure of -0.01MPa, fill high purity argon until the furnace tube of the vacuum tube is slightly positive pressure, and clean the furnace tube 10 times with airflow. (5) close the vacuum valve, close the vacuum pump, open the furnace tube exhaust switch, adjust the flow rate of high purity nitrogen to maintain a slightly positive pressure in the vacuum tube. The tube furnace is heated to 120°C and kept for 3 hours, and then heated to 200°C, and kept at the temperature for 5 hours. Finally, the aqueous solution in the quartz glass boat is dried into white flakes, and the heating system is closed to make the furnace tube naturally Cool to room temperature; (6) Transfer the white flakes to an inert atmosphere glove box, and grind the flakes into powder in it, then put the powder into a vacuum-able quartz tube, and finally move the quartz tube out of the glove box; connect the quartz tube with the vacuum system, and start vacuuming. When the vacuum degree is reduced to 0.1Pa, it is heated to a rate of 5 ℃/min. 400 ℃, and then lower to room temperature after keeping the temperature for 2 hours; (7) In the vacuumed state, the quartz tube is melted and sealed by hydrogen and oxygen flame, the anhydrous strontium iodide powder is obtained. |
| solubility in water (g/100ml) | dissolution grams per 100ml of water at different temperatures (℃): 165g/0 ℃;178g/20 ℃;192g/40 ℃ 218g/60 ℃;270g/80 ℃;365g/90 ℃;383g/100 ℃ |
| Use | Used as a drug and intermediate |
| production method | hydroiodic acid with a concentration of 15% ~ 20% is added dropwise to strontium carbonate for neutralization, and pH = 5.5±0.5 is the end point. The free iodine can be filtered and removed. In case there is a large amount of free iodine, H2S aqueous solution can be added dropwise for reduction during the heating concentration process. Continue to absorb, filter and concentrate to about 100g of solution containing about 300~320g of strontium iodide, and place it for cooling to precipitate strontium iodide hexahydrate. After centrifugal dehydration, it is dried in a dryer. Strontium iodide hexahydrate and ammonium iodide are fully mixed. In a semi-closed glass tube, the temperature is slowly heated under reduced pressure, and the temperature is melted and dehydrated, which can be converted into anhydrous strontium iodide, and crystallized after cooling. |
Last Update：2024-04-10 22:29:15
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