Zirconium(II) hydride

Zirconium(II) hydride
Names
	IUPAC name Zirconium(II) hydride
	Other names Hydride;zirconium(2+); Zirconium(2+) dihydride; Zirconium dihydride;
Identifiers
CAS Number	7704-99-6 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	24771611;
ECHA InfoCard	100.028.844
EC Number	231-727-3;
PubChem CID	4137802;
RTECS number	ZH8015000;
UNII	YHL4O15288;
CompTox Dashboard (EPA)	DTXSID10399770 ;
	InChI InChI=1S/Zr.2H Key: QSGNKXDSTRDWKA-UHFFFAOYSA-N;
	SMILES [ZrH2]; [H-].[H-].[Zr+2];
Properties
Chemical formula	ZrH2
Molar mass	93.240 g/mol
Appearance	Grey tetragonal crystals or dark gray to black metallic powder
Odor	Odorless
Density	5.60 g/cm3
Melting point	800°C (decomposes)
Solubility in water	Insoluble
Solubility	Soluble in HF
Structure
Crystal structure	tetragonal
Molecular shape	dihedral (C2v)
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Skin irritation, eye irritation, flammable
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H228, H315, H319, H335
Precautionary statements	P210, P240, P241, P261, P264, P271, P280, P302+P352, P304+P340+P312, P305+P351+P338, P332+P313, P337+P313, P362, P370+P378, P403+P233, P405, P501
NFPA 704 (fire diamond)	1 3 1
Autoignition; temperature	270 °C
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Zirconium(II) hydride is a molecular chemical compound with the chemical formula Zr H₂. It is a grey crystalline solid or dark gray to black powder. It has been prepared by laser ablation and isolated at low temperature.

Zirconium(II) hydride has repeatedly been the subject of Dirac–Hartree–Fock relativistic calculation studies, which investigate the stabilities, geometries, and relative energies of hydrides of the formula MH₄, MH₃, MH₂, or MH.

Zirconium(II) hydride has a dihedral (C_2v) structure. In zirconium(II) hydride, the formal oxidation states of zirconium and hydrogen are +2 and −1, respectively, because the electronegativity of zirconium is lower than that of hydrogen. The stability of metal hydrides with the formula MH₂ (M = Ti, Zr, Hf) decreases from Ti to Hf.

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