|     Caesium cation, Cs+   Hydrogen anion, H− | |
| Names | |
|---|---|
| IUPAC name Caesium hydride | |
| Other names Cesium hydride | |
| Identifiers | |
| 3D model (JSmol) | |
| ChemSpider | |
|  PubChem CID | |
|  CompTox Dashboard (EPA) | |
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| Properties | |
| CsH | |
| Molar mass | 133.91339 g/mol | 
| Appearance | White or colorless crystals or powder [1] | 
| Density | 3.42 g/cm3 [1] | 
| Melting point | ~170 °C (decomposes) [1] | 
| Structure | |
| Face centered cubic | |
| Octahedral | |
| Related compounds | |
| Other anions  | |
| Other cations  | |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Caesium hydride or cesium hydride is an inorganic compound of caesium and hydrogen with the chemical formula Cs H . It is an alkali metal hydride. It was the first substance to be created by light-induced particle formation in metal vapor, [2] and showed promise in early studies of an ion propulsion system using caesium. [3] It is the most reactive stable alkaline metal hydride of all. It is a powerful superbase and reacts with water extremely vigorously.
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. [5]
At room temperature and atmospheric pressure, CsH has the same structure as NaCl.