Potassium hexachlororhenate
Other names
  • Potassium chlororhenite
  • Potassium hexachlororhenate(IV)
3D model (JSmol)
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EC Number
  • 241-008-6
  • InChI=1S/6ClH.2K.Re/h6*1H;;;/q;;;;;;2*+1;+4/p-6
  • Cl[Re-2](Cl)(Cl)(Cl)(Cl)Cl.[K+].[K+]
Molar mass 477.12 g/mol
Appearance Green solid
Density 3.31 g/cm3
Solubility Soluble in hydrochloric acid
a = 9.84 Å
α = 90°, β = 90°, γ = 90°
953 Å3
214.8 J/(K·mol)[3]
372.0 J/(K·mol)[3]
GHS labelling:
GHS05: Corrosive
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).

Potassium hexachlororhenate, also known as potassium chlororhenite, is an inorganic chemical compound with the formula K2ReCl6. It is a 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]


  1. ^ 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.
  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.
  3. ^ 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.
  4. ^ 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.
  5. ^ 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.
  6. ^ 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.
  7. ^ 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.