Titanium (II) chloride

Crystal structure
__ Ti 2+      __ Cl -
General
Surname	Titanium (II) chloride
other names	Titanium dichloride
Ratio formula	TiCl 2
Brief description	black, self-igniting solid
External identifiers / databases
CAS number 10049-06-6 EC number 233-164-9 ECHA InfoCard 100.030.137 PubChem 66228 Wikidata Q420489
properties
Molar mass	118.79 g mol −1
Physical state	firmly
density	3.13 g cm −3
Melting point	1035 ° C
boiling point	1500 ° C
solubility	Decomposes in water
safety instructions
GHS labeling of hazardous substances danger H and P phrases H: 250-314 EUH: 014 P: 222-231-280-305 + 351 + 338-310-422
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Titanium (II) chloride is a chemical compound of titanium from the group of chlorides .

Extraction and presentation

Titanium (II) chloride is usually obtained by thermal disproportionation of titanium (III) chloride at 500 ° C, although this method does not result in the decomposition reaction of titanium ( II) chloride to titanium (IV) chloride and titanium already taking place pure product can be obtained and this always contains 2-3% free titanium.

${\displaystyle \mathrm {2\ TiCl_{3}\longrightarrow TiCl_{2}+TiCl_{4}} }$

Titanium (II) chloride can also be obtained by reacting titanium with titanium (IV) chloride.

${\displaystyle \mathrm {TiCl_{4}+Ti\longrightarrow 2\ TiCl_{2}} }$

Titanium (II) chloride can be obtained in a very pure and finely divided form by reducing titanium (IV) chloride with hydrogen in an electrodeless electrical discharge.

properties

Titanium (II) chloride is a strong reducing agent (reacts violently with water and oxygen) and has a layered Cadmiumdiiodid - crystal structure , wherein the titanium (II) octahedrally to six chloride ligands is positioned. It forms with derivatives or complex compounds in the TiCl ₂ (R) _2, where R can be a chelate (e.g. dppe or TMEDA ) or a salt (e.g. sodium chloride ). It has a trigonal crystal structure of the cadmium (II) iodide type ( polytype 2H) with the space group P 3 m 1 (space group no.164) and the lattice parameters a = 356.1, c = 587.5 pm.

use

Titanium (II) chloride can be used for the production of pure titanium and as a mediator in organic syntheses.

safety instructions

Titanium (II) chloride is spontaneously flammable (depends, among other things, on the grain size) and forms extremely flammable gases on contact with water or moist air. The reaction with water is violent.

Individual evidence

1. ↑ ^{a b c d e f} entry to titanium (II) chloride in the GESTIS database of IFA , retrieved on July 23, 2016(JavaScript required) .
2. ↑ data sheet at WebElements (English)
3. ↑ ^{a b c d} Georg Brauer (Ed.), With the collaboration of Marianne Baudler a . a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume II, Ferdinand Enke, Stuttgart 1978, ISBN 3-432-87813-3 , p. 1334.
4. ↑ EL Gal'perin, RA Sandler: TiCl ₂ . In: Kristallografiya. 1962, 7, pp. 217-219.
5. ↑ NC Baenziger, RE Rundle: The structure of TiCl ₂ . In: Acta Crystallographica. 1948, 1, p. 274-, doi : 10.1107 / S0365110X48000740 .