Caesium hexafluorosilicate
| Caesium hexaflurosilicate | |
|---|---|
| IUPAC name | Caesium hexafluoridosilicate |
| Other names | Caesium fluorosilicate Caesium fluosilicate |
| Identifiers | |
| InChI | InChI=1/2Cs.F6Si/c;;1-7(2,3,4,5)6/q2*+1;-2 |
| InChIKey | GPCOEBKPRWAIIW-UHFFFAOYAV |
| Standard InChI | InChI=1S/2Cs.F6Si/c;;1-7(2,3,4,5)6/q2*+1;-2 |
| Standard InChIKey | GPCOEBKPRWAIIW-UHFFFAOYSA-N |
| CAS number | [] |
| ChemSpider | |
| Properties[1] | |
| Chemical formula | Cs2SiF6 |
| Molar mass | 407.89 g/mol |
| Density | 3.372 g/cm3, solid (17 ºC) |
| Solubility in water | 60 g/100 ml (17 ºC) |
| Solubility in ethanol | insoluble |
| Hazards[2] | |
| EU index number | 009-012-00-0 |
| GHS pictograms | 
|
| GHS signal word | DANGER |
| GHS hazard statements | H331, H311, H301 |
| Flash point | non-flammable |
| Related compounds | |
| Other anions | Caesium tetrafluoroaluminate |
| Other cations | Lithium hexafluorosilicate Sodium hexafluorosilicate Potassium hexafluorosilicate Rubidium hexafluorosilicate |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Caesium hexafluorosilicate, also known simply as caesium fluorosilicate, Cs2SiF6, is the caesium salt of hexafluorosilicic acid. It is prepared by the reaction between hexafluorosilicic acid and caesium hydroxide:[3]
- 2CsOH + H2SiF6 → Cs2SiF6 + 2H2O
It is used as a brazing flux, especially for aluminium alloys.[3]
References
- ↑ CRC Handbook of Chemistry and Physics, 62nd ed.; Weast, Robert C., Ed.; CRC Press: Boca Raton, FL, 1981; p B-91. ISBN 0-8493-0462-8.
- ↑ Index no. 009-012-00-0 of Annex VI, Part 3, to Regulation (EC) No 1272/2008 of the European Parliament and of the Council of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006. OJEU L353, 31.12.2008, pp 1–1355 at p 364.
- ↑ 3.0 3.1 Meshri, Dayal T.; Meshri, Sanjay D.; Contractor, Dinshaw B., et al. (Advance Research Chemicals, Inc.) Brazing flux. US Patent 5785770, published 20 May 1998.
External links
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