Titanium(II) chloride

Titanium(II) chloride is the chemical compound with the formula TiCl2. The black solid has been studied only moderately, probably because of its high reactivity. Ti(II) is a strong reducing agent: it has a high affinity for oxygen and reacts irreversibly with water to produce H2. The usual preparation is the thermal disproportionation of TiCl3 at 500 °C. The reaction is driven by the loss of volatile TiCl4:

2 TiCl3 → TiCl2 + TiCl4
Titanium(II) chloride
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.030.137
EC Number
  • 233-164-9
UNII
  • InChI=1S/2ClH.Ti/h2*1H;/q;;+2/p-2 Y
    Key: ZWYDDDAMNQQZHD-UHFFFAOYSA-L Y
  • InChI=1/2ClH.Ti/h2*1H;/q;;+2/p-2
    Key: ZWYDDDAMNQQZHD-NUQVWONBAH
  • [Ti+2].[Cl-].[Cl-]
Properties
Cl2Ti
Molar mass 118.77 g·mol−1
Appearance black hexagonal crystals
Density 3.13 g/cm3
Melting point 1,035 °C (1,895 °F; 1,308 K)
Boiling point 1,500 °C (2,730 °F; 1,770 K)
+570.0·10−6 cm3/mol
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 pyrophoric
GHS labelling:
Danger
H250, H314
P210, P222, P260, P264, P280, P301+P330+P331, P302+P334, P303+P361+P353, P304+P340, P305+P351+P338, P310, P363, P370+P378, P405, P422
Safety data sheet (SDS) External MSDS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

The method is similar to that for the conversion of VCl3 into VCl2 and VCl4.

TiCl2 crystallizes as the layered CdI2 structure. Thus, the Ti(II) centers are octahedrally coordinated to six chloride ligands.

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