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Beryllium iodide

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Beryllium iodide
Names
Systematic IUPAC name
Beryllium iodide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.199 Edit this at Wikidata
UNII
  • InChI=1S/Be.2HI/h;2*1H/q+2;;/p-2 checkY
    Key: JUCWKFHIHJQTFR-UHFFFAOYSA-L checkY
  • InChI=1/Be.2HI/h;2*1H/q+2;;/p-2
    Key: JUCWKFHIHJQTFR-NUQVWONBAT
  • I[Be]I
  • I[Be-2](I)([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1([I+]1)[I+][Be-2]1(I)I
Properties
BeI2
Molar mass 262.82112 g·mol−1
Appearance colorless needle-like crystals
Density 4.325 g/cm3
Melting point 480 °C (896 °F; 753 K)
Boiling point 590 °C (1,094 °F; 863 K)[1]
reacts with water[1][citation needed]
Solubility Slightly soluble in CS2
Soluble in ethanol, diethyl ether[2]
Structure
orthorhombic
Thermochemistry
71.14 J/(mol·K)
130 J/(mol·K)
−192.62 kJ/mol
−210 kJ/mol
19 kJ/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 see Berylliosis
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 3: Short exposure could cause serious temporary or residual injury. E.g. chlorine gasFlammability 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g. gasolineInstability 2: Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water. E.g. white phosphorusSpecial hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid
3
3
2
W
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.002 mg/m3
C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be)[3]
REL (Recommended)
 Ca C 0.0005 mg/m3 (as Be)[3]
IDLH (Immediate danger)
 Ca [4 mg/m3 (as Be)][3]
Related compounds
Other anions
Other cations
Related compounds
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Beryllium iodide is an inorganic compound with the chemical formula BeI2. It is a beryllium salt of hydrogen iodide. It is a hygroscopic white solid.

Reactions

[edit]

Beryllium iodide can be prepared by reacting beryllium metal with elemental iodine at temperatures of 500 °C to 700 °C:[1]

Be + I2 → BeI2

Beryllium iodide is also formed when beryllium carbide reacts with hydrogen iodide in the gas phase:

Be2C + 4 HI → 2 BeI2 + CH4

Beryllium iodide reacts with fluorine giving beryllium fluoride and fluorides of iodine, with chlorine giving beryllium chloride, and with bromine giving beryllium bromide.

Structure

[edit]

Two forms (polymorphs) of BeI2 are known. Both structures consist tetrahedral Be2+ centers interconnected by doubly bridging iodide ligands. One form consist of edge-sharing polytetrahedra. The other form resembles zinc iodide with interconnected adamantane-like cages.[4]

Applications

[edit]

Beryllium iodide can be used in the preparation of high-purity beryllium by the decomposition of the compound on a hot tungsten filament.

References

[edit]
  1. ^ a b c Perry, Dale L.; Phillips, Sidney L. (1995), Handbook of Inorganic Compounds, CRC Press, p. 63, ISBN 0-8493-8671-3, retrieved 2007-12-10
  2. ^ Parsons, Charles Lathrop (1909), The Chemistry and Literature of Beryllium, Easton, Pa.: Chemical Publishing, pp. 22–23, retrieved 2007-12-10
  3. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0054". National Institute for Occupational Safety and Health (NIOSH).
  4. ^ Troyanov, S.I. (2000). "Crystal Modifications of Beryllium Dihalides BeCl2, BeBr2 and BeI2". Zhurnal Neorganicheskoi Khimii. 45: 1619–1624.
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