| Names | |
|---|---|
| IUPAC name
Plutonium dihydride (excess hydrogen) | |
| Systematic IUPAC name
Plutonium(2+) hydride | |
| Other names
Plutonium dihydride
Plutonium(II) hydride | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties | |
| H2Pu | |
| Molar mass | 246 g·mol−1 |
| Appearance | Black, opaque crystals |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Plutonium hydride is a non-stoichiometric chemical compound with the formula PuH2+x. It is one of two characterized hydrides of plutonium; the other is PuH3.[1] PuH2+xisnon-stoichiometric with a composition range of PuH2 – PuH2.7. Metastable stoichiometries with an excess of hydrogen (PuH2.7 – PuH3) can also be formed.[1] PuH2 has a cubic structure. It is readily formed from the elements at 1 atmosphere at 100–200°C:[1] When the stoichiometry is close to PuH2 it has a silver appearance, but gets blacker as the hydrogen content increases, additionally the color change is associated with a reduction in conductivity.[2]
Studies of the reaction of plutonium metal with moist air at 200–350°C showed the presence of cubic plutonium hydride on the surface along with Pu2O3, PuO2 and a higher oxide identified by X-ray diffraction and X-ray photoelectron spectroscopy as the mixed-valence phase PuIV3−xPuVIxO6+x.[3] Investigation of the reaction performed without heating suggests that the reaction of Pu metal and moist air the production of PuO2 and a higher oxide along with adsorbed hydrogen, which catalytically combines with O2 to form water.[4]
Like the free metal, plutonium dihydride is pyrophoric. On the surface of hydrided plutonium, it acts as a catalyst for the oxidation of the metal with consumption of both O2 and N2 from air.[5]
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| Alkali metal (Group 1) hydrides |
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| Alkaline (Group 2) earth hydrides |
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| Group 13 hydrides |
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| Group 14 hydrides |
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| Pnictogen (Group 15) hydrides |
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| Hydrogen chalcogenides (Group 16 hydrides) |
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| Hydrogen halides (Group 17 hydrides) |
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| Transition metal hydrides |
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| Lanthanide hydrides |
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| Actinide hydrides |
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| Exotic matter hydrides |
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