Potassium hexachlororhenate

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Potassium hexachlororhenate - Wikipedia

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Potassium hexachlororhenate
Names

Other names Potassium chlororhenite Potassium hexachlororhenate(IV)
Identifiers
CAS Number	16940-97-9^Y
3D model (JSmol)	Interactive image
ChemSpider	9114955
ECHA InfoCard	100.037.265
EC Number	241-008-6
PubChem CID	10939720
InChI InChI=1S/6ClH.2K.Re/h61H;;;/q;;;;;;2+1;+4/p-6 Key: HGCRXIXEXSEJGV-UHFFFAOYSA-H
SMILES Cl[Re-2](Cl)(Cl)(Cl)(Cl)Cl.[K+].[K+]
Properties
Chemical formula	K₂ReCl₆
Molar mass	477.12 g/mol
Appearance	Light green solid
Density	3.31 g/cm³
Solubility in water	Soluble, slowly hydrolyses^[1]
Solubility	Soluble in hydrochloric acid
Structure^[2]
Crystal structure	cubic
Space group	Fm3m
Lattice constant	a = 9.84 Å α = 90°, β = 90°, γ = 90°
Lattice volume (V)	953 Å³
Thermochemistry
Heat capacity (C)	214.8 J/(K·mol)^[3]
Std molar entropy (S^⦵₂₉₈)	372.0 J/(K·mol)^[3]
Hazards
GHS labelling:
Pictograms
Signal word	Danger
Safety data sheet (SDS)	Sigma-Aldrich
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Potassium hexachlororhenate, also known as potassium chlororhenite, is an inorganic chemical compound with the formula K₂ReCl₆. It is a light-green crystalline solid soluble in hydrochloric acid.

Production and reactions

Potassium hexachlororhenate is most commonly prepared by the reduction of potassium perrhenate with potassium iodide, hypophosphorous acid, or chromium(II) chloride in the presence of hydrochloric acid.^[4]^[5]^[6]

It reacts with silver nitrate to produce silver hexachlororhenate, which in turn decomposes at 400 °C to rhenium(III) chloride.^[7]

In water, it hydrolyses to form rhenium(IV) oxide.^[1]

References

^ ^a ^b M. Pavlova; N. Jordanov; N. Popova (1974). "The hydrolysis of potassium hexachlororhenate". Journal of Inorganic and Nuclear Chemistry. 36 (12): 3845–3847. doi:10.1016/0022-1902(74)80175-2.
^ H. D. Grundy; I. D. Brown (1970). "A refinement of the crystal structures of K2ReCl6, K2ReBr6, and K2PtBr6". Canadian Journal of Chemistry. 48 (7): 1033–1045. doi:10.1139/v70-189.
^ ^a ^b R. H. Busey; H. H. Dearman; R. B. Bevan Jr. (1962). "THE HEAT CAPACITY OF POTASSIUM HEXACHLORORHENATE(IV) FROM 7 TO 320K. ANOMALIES NEAR 12, 76, 103, AND 111K. ENTROPY AND FREE ENERGY FUNCTIONS. SOLUBILITY AND HEAT OF SOLUTION OF K2ReCl6. ENTROPY OF THE HEXACHLORORHENATE ION1". The Journal of Physical Chemistry. 66 (1): 82–89. doi:10.1021/j100807a017.
^ Loren C. Hurd; Victor A. Reinders; W. A. Taebel; B. S. Hopkins (1939). "Potassium Chlororhenite". In Booth, Harold (ed.). Inorganic Syntheses (1 ed.). The McGraw-Hill Book Company. pp. 178–180. doi:10.1002/9780470132326.ch61. ISBN 9780470131602. Retrieved 12 November 2023.
^ Villiers W. Meloche; Ronald Martin (1956). "Synthesis of Potassium Hexachlororhenate and Potassium Hexabromorhenate". Journal of the American Chemical Society. 78 (22): 5955–5956. doi:10.1021/ja01603a067.
^ George W. Watt; Richard J. Thompson; Jean M. Gibbons (1963). "Potassium Hexachlororhenate(IV) and Potassium Hexabromorhenate(IV)". In Kleinberg, Jacob (ed.). Inorganic Syntheses (7th ed.). McGraw-Hill Book Company. pp. 189–192. doi:10.1002/9780470132388.ch51. ISBN 9780470131664. Retrieved 12 November 2023.
^ J. P. King; J. W. Cobble (1960). "The Thermodynamic Properties of Technetium and Rhenium Compounds. VII. Heats of Formation of Rhenium Trichloride and Rhenium Tribromide. Free Energies and Entropies". Journal of the American Chemical Society. 82 (9): 2111–2113. doi:10.1021/ja01494a005.

v t e Potassium compounds
H, (pseudo)halogens	KF KHF₂ KH KCl KClO KClO₃ KClO₄ KBr KBrO₃ KI KIO₃ KIO₄ KAt KCN KCNO KOCN KSCN
chalcogens	K₂O KOH K₂O₂ KO₂ KO₃ K₂S KHS K₂SO₃ KHSO₃ K₂SO₄ KHSO₄ KHSO₅ K₂S₂O₃ K₂S₂O₅ K₂S₂O₇ K₂S₂O₈ K₂Se K₂SeO₃ K₂SeO₄ K₂Te K₂TeO₃ K₂TeO₄ K₂Po
pnictogens	K₃N KNH₂ KN₃ KNO₂ KNO₃ K₃P KH₂PO₃ K₃PO₄ K₂HPO₄ KH₂PO₄ KPF₆ KAsO₂ K₃AsO₄ K₂HAsO₄ KH₂AsO₄
B, C group	B₄K₂O₇ K₂CO₃ KHCO₃ K₂SiO₃ K₂SiF₆ K₂Al₂O₄ K₂Al₂B₂O₇
transition metals	K₂PtCl₄ K₂Pt(CN)₄ K₂TiF₆ K₂PtCl₆ K₂ReCl₆ K ₂ReF ₆ KAsF₆ K₂ReBr₆ K ₂ReI ₆ K₂ZrF₆ K₄Fe(CN)₆ K₃Fe(CN)₆ K₃Fe(C₂O₄)₃ K₂FeO₄ K₂MnO₄ KMnO₄ K₃CrO₄ K₂CrO₄ K₃CrO₈ KCrO₃Cl K₂Cr₂O₇ K₂Cr₃O₁₀ K₂Cr₄O₁₃ K₄Mo₂Cl₈
organic	KHCO₂ KCH₃CO₂ KCF₃CO₂ K₂C₂O₄ KHC₂O₄ KC₁₂H₂₃O₂ KC₁₈H₃₅O₂ C₃H₂K₂O₄ C₄H₆KO₄ C₅H₇KO₄

Rhenium compounds

Rhenium(0)

Organorhenium(0)	Re₂(CO)₁₀

Rhenium(I)

Organorhenium(I)	Re(CO)₅Br ReH(CO)₅

Rhenium(II)

ReB₂

Rhenium(III)

Rhenium(IV)

Rhenium(V)

Rhenium(VI)

Rhenium(VII)

Perrhenates	Re₂O₇(OH₂)₂ NH₄ReO₄ NaReO₄ AgReO₄
Organorhenium(VII)	CH₃ReO₃

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