Antimony triiodide

Antimony triiodide is the chemical compound with the formula SbI3. This ruby-red solid is the only characterized "binary" iodide of antimony, i.e. the sole compound isolated with the formula SbxIy. It contains antimony in its +3 oxidation state. Like many iodides of the heavier main group elements, its structure depends on the phase. Gaseous SbI3 is a molecular, pyramidal species as anticipated by VSEPR theory. In the solid state, however, the Sb center is surrounded by an octahedron of six iodide ligands, three of which are closer and three more distant. For the related compound BiI3, all six Bi—I distances are equal.

Antimony triiodide
Names
IUPAC name
Antimony triiodide, Antimony(III) iodide
Systematic IUPAC name
Triiodostibane
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.278
EC Number
  • 232-205-8
PubChem CID
UNII
  • InChI=1S/3HI.Sb/h3*1H;/q;;;+3/p-3 Y
    Key: KWQLUUQBTAXYCB-UHFFFAOYSA-K Y
  • InChI=1/3HI.Sb.3H/h3*1H;;;;/q;;;+3;;;/p-3/r3HI.H3Sb/h3*1H;1H3/q;;;+3/p-3
    Key: JYIUOADDPFDEAV-GODZFDHEAT
  • InChI=1/3HI.Sb/h3*1H;/q;;;+3/p-3
    Key: KWQLUUQBTAXYCB-DFZHHIFOAA
SMILES
  • [SbH3+3].[I-].[I-].[I-]
  • I[Sb](I)I
Properties
I3Sb
Molar mass 502.473 g·mol−1
Appearance red crystals
Density 4.921 g/cm3
Melting point 170.5 °C (338.9 °F; 443.6 K)
Boiling point 401.6 °C (754.9 °F; 674.8 K)
soluble, partially hydrolyses
Solubility soluble in benzene, alcohol, acetone, CS2, HCl, KI, SnCl4, C2H7N
,HI,alkali metal triiodides 
insoluble in CHCl3, CCl4
Solubility in diiodomethane 10.15% v/v (12 °C)
Magnetic susceptibility (χ)
 -147.0·10−6 cm3/mol
Structure
Rhombohedral, hR24,
Space group
 R-3, No. 148
1.58 D
Thermochemistry
81.6 J/mol·K (gas)
Std enthalpy of
formation (ΔfH⦵298)
 -100.4 kJ/mol
Hazards
GHS labelling:
Warning
H302, H332, H411
P273
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.5 mg/m3 (as Sb)
REL (Recommended)
 TWA 0.5 mg/m3 (as Sb)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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