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Strontium iodide

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Strontium iodide
Names
IUPAC name
Strontium iodide
Identifiers
3D model (JSmol)
ECHA InfoCard 100.030.871 Edit this at Wikidata
EC Number
  • 233-972-1
RTECS number
  • WK9275000
UNII
  • InChI=1S/2HI.Sr/h2*1H;/q;;+2/p-2
  • [Sr+2].[I-].[I-]
Properties
SrI2 (anhydrous)
SrI2·6H2O (hexahydrate)
Molar mass 341.43 g/mol (anhydrous)
Appearance Colorless to white crystalline plates
Density 4.55 g/cm3 (anhydrous)[1]
4.40 g/cm3 (hexahydrate)[1]
Melting point 507 to 645 °C (945 to 1,193 °F; 780 to 918 K)[3]
Boiling point 1,773 °C (3,223 °F; 2,046 K) (decomposes)
177.0 g/100 mL (20 °C)[2]
Solubility in ethanol 3.1 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
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
0
0
Related compounds
Other anions
 strontium fluoride
strontium chloride
strontium bromide
Other cations
 beryllium iodide
magnesium iodide
calcium iodide
barium iodide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Strontium iodide (SrI2) is a salt of strontium and iodine. It is an ionic, water-soluble, and deliquescent compound that can be used in medicine as a substitute for potassium iodide .[5] It is also used as a scintillation gamma radiation detector, typically doped with europium, due to its optical clarity, relatively high density, high effective atomic number (Z=48), and high scintillation light yield.[6]

Reactions

Strontium iodide can be prepared by reacting strontium carbonate with hydroiodic acid:

SrCO3 + 2 HI → SrI2 + H2O + CO2

Strontium iodide yellows when exposed to air. At high temperatures (when in the presence of air) strontium iodide completely decomposes to form strontium oxide and free iodine.[7]

References

  1. ^ a b Yaws, C.L. (2008). Thermophysical properties of chemicals and hydrocarbons. William Andrew. ISBN 978-0-8155-1596-8.
  2. ^ a b
    177 g/100 mL (20 °C) Seidell, Atherton (1907), Solubilities of Inorganic and Organic Substances, New York: D. Van Nostrand, p. 318, retrieved 2007-12-10
  3. ^ Turner, Jr., Francis M., ed. (1920), The Condensed Chemical Dictionary, New York: The Chemical Catalog Company, p. 449, retrieved 2007-12-10
  4. ^ 400696 Strontium iodide anhydrous, beads, −10 mesh, 99.99+ %
  5. ^ Shoemaker, John V. (1908), A Practical Treatise on Materia Medica and Therapeutics (7th ed.), Philadelphia: F. A. Davis, p. 854, retrieved 2007-12-10
  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. ^ Bartley, Elias H. (1898), Text-book of Medical and Pharmaceutical Chemistry (5th ed.), Philadelphia: P. Blakiston, pp. 267–268, retrieved 2007-12-10
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