Caesium hydride
Chemical compound
From Wikipedia, the free encyclopedia
Caesium hydride or cesium hydride is an inorganic compound of caesium and hydrogen with the chemical formula CsH. It is an alkali metal hydride. It was the first substance to be created by light-induced particle formation in metal vapor, and showed promise in early studies of an ion propulsion system using caesium.[2][3] It is the most reactive stable alkaline metal hydride. It is a powerful superbase and reacts with water extremely vigorously.
Caesium cation, Cs+ Hydrogen anion, H− | |
| Names | |
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| IUPAC name
Caesium hydride | |
| Other names
Cesium hydride | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
PubChem CID |
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CompTox Dashboard (EPA) |
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| Properties[1] | |
| CsH | |
| Molar mass | 133.913 g·mol−1 |
| Appearance | White cubic crystals |
| Density | 3.42 g/cm3 |
| Melting point | 528 °C (982 °F; 801 K) |
| reacts | |
| Structure | |
| Face centered cubic | |
| Octahedral | |
| Thermochemistry[1] | |
Std enthalpy of formation (ΔfH⦵298) |
−54.2 kJ⋅mol−1 |
Enthalpy of fusion (ΔfH⦵fus) |
15 kJ⋅mol−1 |
| Related compounds | |
Other anions |
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Other cations |
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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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The caesium nucleus in CsH can be hyperpolarized through interactions with an optically pumped caesium vapor in a process known as spin-exchange optical pumping (SEOP). SEOP can increase the nuclear magnetic resonance (NMR) signal of caesium nucleus by an order of magnitude.[4]
It is very difficult to make caesium hydride in a pure form. Caesium hydride can be produced by heating caesium carbonate and metallic magnesium in hydrogen at 580 to 620 °C (1,076 to 1,148 °F).[5]
Crystal structure
At room temperature and atmospheric pressure, CsH has the same structure as NaCl.[citation needed]
