Potassium nonahydridorhenate
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| Identifiers | |
|---|---|
| Properties | |
| K2ReH9 | |
| Molar mass | 273.473 g/mol |
| Appearance | white solid |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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| Infobox references | |
Potassium nonahydridorhenate(VII) is an inorganic compound having the formula K2ReH9. This colourless salt that is soluble in water but only poorly soluble in most alcohols. The ReH2−
9 anion is a rare example of a coordination complex bearing only hydride ligands.
The study of rhenium hydrides can be traced to the 1950s and included reports of the "rhenide" anion, supposedly Re−. These reports led to a series of investigations by A. P. Ginsberg and coworkers on the products from the reduction of perrhenate.
The rhenide anion, Re−, was based on the product of the reduction of perrhenate salts, such as the reduction of potassium perrhenate (KReO
4) by potassium metal. "Potassium rhenide" was shown to exist as a tetrahydrated complex, with the postulated chemical formula KRe·4H
2O. This compound exhibits strongly reducing properties, and slowly yields hydrogen gas when dissolved in water. The lithium and thallous salts were also reported. Later research, however, indicates that the "rhenide" ion is actually a hydridorhenate complex. "Potassium rhenide" was shown to be in fact the nonahydridorhenate, K
2ReH
9, containing the ReH2−
9 anion in which the oxidation state of rhenium is actually +7. Other methods of reduction of perrhenate salts yield compounds containing other hydrido- complexes, including ReH
3(OH)
3(H
2O)−
.
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