Rhenium (IV) chloride
Crystal structure | |||||||||||||
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__ Re 4+ __ Cl - | |||||||||||||
Crystal system |
monoclinic |
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Space group |
P 2 / c (No. 13) |
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Lattice parameters |
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General | |||||||||||||
Surname | Rhenium (IV) chloride | ||||||||||||
other names |
Rhenium tetrachloride |
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Ratio formula | ReCl 4 | ||||||||||||
Brief description |
brown or black solid |
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External identifiers / databases | |||||||||||||
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properties | |||||||||||||
Molar mass | 328.02 g mol −1 | ||||||||||||
Physical state |
firmly |
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density |
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Melting point |
300 ° C (decomposition) |
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safety instructions | |||||||||||||
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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.
γ-Rhenium (IV) chloride can be obtained by reacting rhenium (V) chloride with tetrachloroethene at 120 ° C.
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.
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).