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Strontium iodide

From Wikipedia, the free encyclopedia
Strontium iodide
Names
IUPAC name
Strontium iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard100.030.871Edit this at Wikidata
EC Number
  • 233-972-1
RTECS number
  • WK9275000
UNII
  • InChI=1S/2HI.Sr/h2*1H;/q;;+2/p-2
  • I[Sr]I
  • [Sr+2].[I-].[I-]
Properties
SrI2 (anhydrous)
SrI2·6H2O (hexahydrate)
Molar mass341.43 g·mol−1 (anhydrous)
AppearanceColorless to white crystalline plates
Density4.55 g/cm3 (anhydrous)[1]
4.40 g/cm3 (hexahydrate)[1]
Melting point507 to 645 °C (945 to 1,193 °F; 780 to 918 K)[3]
Boiling point1,773 °C (3,223 °F; 2,046 K) (decomposes)
177.0 g/100 mL (20 °C)[2]
Solubility inethanol3.1 g/100 ml (4 °C)[2]
−112.0·10−6 cm3/mol
Structure
Orthorhombic,oP24
Pbca, No. 61
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
Corrosive
GHS labelling:[4]
GHS05: Corrosive
Danger
H314
P280,P305+P351+P338,P310
NFPA 704 (fire diamond)
Related compounds
Otheranions
strontium fluoride
strontium chloride
strontium bromide
Othercations
beryllium iodide
magnesium iodide
calcium iodide
barium iodide
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound

Strontium iodide is aninorganic compound with thechemical formulaSrI2. It is asalt ofstrontium andiodine. It forms ahexahydrateSrI2·6H2O. It is an ionic, water-soluble, anddeliquescent compound that can be used in medicine as a substitute forpotassium iodide.[5]It is also used as ascintillationgamma radiation detector, typicallydoped witheuropium, due to its optical clarity, relatively high density, higheffective atomic number (Z=48), and high scintillation light yield.[6] In recent years, europium-doped strontium iodide (SrI2:Eu2+) has emerged as a promising scintillation material for gamma-ray spectroscopy with extremely high light yield and proportional response, exceeding that of the widely used high performance commercial scintillatorLaBr3:Ce3+. Large diameterSrI2 crystals can be grown reliably using vertical Bridgman technique[7] and are being commercialized by several companies.[8][9]

Reactions

[edit]

Strontium iodide can be prepared by reactingstrontium carbonate withhydroiodic acid:

SrCO3 + 2HI(aq) → SrI2 +H2O +CO2

Strontium iodide forms a white powder that slowly changes to a yellowish colour when exposed to air. At high temperatures (in the presence of air) strontium iodide completely decomposes to formstrontium oxide and freeiodine.[10]

References

[edit]
  1. ^abYaws, C.L. (2008).Thermophysical properties of chemicals and hydrocarbons. William Andrew.ISBN 978-0-8155-1596-8.
  2. ^ab
    177 g/100 mL (20 °C)Seidell, Atherton (1907),Solubilities of Inorganic and Organic Substances, New York: D. Van Nostrand, p. 318, retrieved2007-12-10
  3. ^Turner, Jr., Francis M., ed. (1920),The Condensed Chemical Dictionary, New York: The Chemical Catalog Company, p. 449, retrieved2007-12-10
  4. ^"Strontium iodide". Sigma Aldrich.
  5. ^Shoemaker, John V. (1908),A Practical Treatise on Materia Medica and Therapeutics (7th ed.), Philadelphia: F. A. Davis, p. 854, retrieved2007-12-10
  6. ^Prettyman, Thomas; Burger, Arnold; Yamashita, Naoyuki; Lambert, James; Stassun, Keivan; Raymond, Carol (2015). "Ultra-bright scintillators for planetary gamma-ray spectroscopy".SPIE Newsroom.doi:10.1117/2.1201510.006162.ISSN 1818-2259.
  7. ^Datta, A.; Lam, S.; Swider, S.; Motakef, S. (October 2016). "Crystal growth of large diameter strontium iodide scintillators using in Situ stoichiometry monitoring".2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD). pp. 1–4.doi:10.1109/NSSMIC.2016.8116640.ISBN 978-1-5090-1642-6.S2CID 31775311.
  8. ^Inc., CapeSym."CapeSym | SrI2(Eu)".www.capesym.com. Retrieved2018-02-13.{{cite web}}:|last= has generic name (help)
  9. ^"Strontium Iodide | RMD".rmdinc.com. Archived fromthe original on 2018-02-14. Retrieved2018-02-13.
  10. ^Bartley, Elias H. (1898),Text-book of Medical and Pharmaceutical Chemistry (5th ed.), Philadelphia: P. Blakiston, pp. 267–268, retrieved2007-12-10
Salts and covalent derivatives of theiodide ion
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