Rhenium (IV) chloride

Crystal structure
	__ Re 4+ __ Cl -
Crystal system	monoclinic
Space group	P 2 / c (No. 13)
Lattice parameters	β-modification: a = 636.2 pm, b = 627.3 pm, c = 1216.5 pm, β = 93.15 °; γ modification: a = 1843 pm, b = 627 pm, c = 1817 pm, β = 104.0 °;
General
Surname	Rhenium (IV) chloride
other names	Rhenium tetrachloride
Ratio formula	ReCl 4
Brief description	brown or black solid
External identifiers / databases
EC number	236-989-2
ECHA InfoCard	100.033.612
Wikidata	Q4498233
properties
Molar mass	328.02 g mol −1
Physical state	firmly
density	4.5 g cm −3 (β); 3.99 g cm −3 (γ);
Melting point	300 ° C (decomposition)
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Rhenium (IV) chloride is an inorganic chemical compound of rhenium from the group of chlorides .

Extraction and presentation

β-Rhenium (IV) chloride can be obtained by reacting rhenium (V) chloride with antimony (III) chloride or rhenium (III) chloride at 300 ° C.

{\ displaystyle {\ ce {2ReCl5 + SbCl3 -> 2ReCl4 + SbCl5}}}

γ-Rhenium (IV) chloride can be obtained by reacting rhenium (V) chloride with tetrachloroethene at 120 ° C.

{\ displaystyle {\ ce {2ReCl5 + C2Cl4 -> 2ReCl4 + C2Cl6}}}

properties

β-rhenium (IV) chloride is a black powder. It is stable in dry air, hydrolysis takes place in moist air and with water . It has a monoclinic crystal structure with the space group P 2 / c (space group no. 13) and the lattice parameters a = 636.2 pm, b = 627.3 pm, c = 1216.5 pm and β = 93.15 °. The crystal structure consists of linked Re ₂ Cl ₉ assemblies. It is insoluble in acetonitrile , tetrahydrofuran , benzene and carbon tetrachloride . It is slowly soluble in methanol , ethanol , acetone and dimethyl sulfoxide , with subsequent decomposition. It is soluble in hydrochloric acid with a blue color and decomposes under nitrogen at 300 ° C into rhenium (III) chloride and rhenium (V) chloride. Template: room group / 13

γ-rhenium (IV) chloride is a brown powder with a monoclinic crystal structure (a = 1843 pm, b = 627 pm, c = 1817 pm, β = 104.0 °). It is stable in dry air; hydrolysis also takes place in moist air and with water. It is insoluble in benzene and carbon tetrachloride, but soluble in acetone, tetrahydrofuran and acetonitrile with a green color.

The α-modification obtained by reacting a rhenium (IV) oxide solution with thionyl chloride is poorly characterized and always impure.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1610.
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ Erwin Riedel, Christoph Janiak: Inorganic Chemistry . Walter de Gruyter, 2011, ISBN 3-11-022567-0 , p. 836 ( limited preview in Google Book search).

[brauer-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1610.

[NV-2] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[Erwin_Riedel,_Christoph_Janiak-3] Erwin Riedel, Christoph Janiak: Inorganic Chemistry . Walter de Gruyter, 2011, ISBN 3-11-022567-0 , p. 836 ( limited preview in Google Book search).