Titanium(II) chloride
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3D model (
JSmol ) |
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ChemSpider | |
ECHA InfoCard
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100.030.137 |
EC Number |
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PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
Cl2Ti | |
Molar mass | 118.77 g·mol−1 |
Appearance | black hexagonal crystals
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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
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pyrophoric |
GHS labelling:[1] | |
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).
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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.[2] 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
The method is similar to that for the conversion of
TiCl2 crystallizes as the layered CdI2 structure. Thus, the Ti(II) centers are octahedrally coordinated to six chloride ligands.[3][4]
Derivatives
Molecular complexes are known such as TiCl2(chel)2, where chel is
Unusual electronic effects have been observed in these species: TiCl2[(CH3)2PCH2CH2P(CH3)2]2 is paramagnetic with a triplet ground state, but Ti(CH3)2[(CH3)2PCH2CH2P(CH3)2]2 is diamagnetic.[6]
A solid-state derivative of TiCl2 is Na2TiCl4, which has been prepared by the reaction of Ti metal with TiCl3 in a NaCl flux.[7] This species adopts a linear chain structure wherein again the Ti(II) centers are octahedral with terminal, axial halides.[8]
References
- ^ "Titanium dichloride". pubchem.ncbi.nlm.nih.gov. Retrieved 12 December 2021.
- ISBN 0-12-352651-5.
- ^ Gal'perin, E. L.; Sandler, R. A. (1962). "TiCI2". Kristallografiya. 7: 217–19.
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- doi:10.1039/dt9850001339.)
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