Caesium hydride

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,^[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.

Caesium hydride

Caesium cation, Cs+   Hydrogen anion, H−
Names
IUPAC name Caesium hydride
Other names Cesium hydride
Identifiers
CAS Number	13772-47-9 N
3D model (JSmol)	Interactive image
ChemSpider	122830 Y
PubChem CID	139281
CompTox Dashboard (EPA)	DTXSID10276375
InChI InChI=1S/Cs.H/q+1;-1 Y Key: HXCOCQWMKNUQSA-UHFFFAOYSA-N Y InChI=1S/Cs.H/q+1;-1 Key: HXCOCQWMKNUQSA-UHFFFAOYSA-N
SMILES [H-].[Cs+]
Properties
Chemical formula	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
Crystal structure	Face centered cubic
Coordination geometry	Octahedral
Related compounds
Other anions	CsF CsCl CsBr CsI
Other cations	LiH NaH KH RbH Hydrides
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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]

Crystal structure

At room temperature and atmospheric pressure, CsH has the same structure as NaCl.