Cobalt(II) hydride

Cobalt(II) hydride
Names
	Other names Cobalt dihydride, cobaltous hydride
Identifiers
3D model (JSmol)	Interactive image;
ChemSpider	464927;
PubChem CID	22450701;
	InChI InChI=1S/Co.2H/q+2;2*-1 Key: RDKRCUAPGSVALD-UHFFFAOYSA-N;
	SMILES [H-].[H-].[Co+2];
Properties
Chemical formula	CoH2
Molar mass	60.949 g·mol−1
Appearance	dark grey crystals
Density	0.533 g/cm3
Solubility in water	reacts
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	highly reacts
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Cobalt(II) hydride is an inorganic compound with a chemical formula CoH₂. It has dark grey crystals. It oxidizes slowly in air and reacts with water.^[1]^[2]

Two forms of cobalt(II) hydride exist under high pressure. From 4 to 45 GPa there is a face-centred cubic form with formula CoH. This can be decompressed at low temperatures to form a metastable compound at atmospheric pressure. Over 45 GPa a cobalt(II) hydride CoH₂ also crystallises in a face-centred cubic form.^[3]

Preparation

Cobalt(II) hydride can prepared by reacting phenylmagnesium bromide and cobalt(II) chloride in hydrogen gas:

CoCl₂ + 2 C₆H₅MgBr + 2 H₂ → CoH₂ + 2 C₆H₆ + MgBr₂ + MgCl₂

References

^ Химическая энциклопедия. Vol. 2. М.: Советская энциклопедия. 1990. ISBN 5-85270-035-5 – via Редкол.: Кнунянц И.Л. и др.
^ Рипан Р., Четяну И. (1972). Неорганическая химия. Химия металлов. Vol. 2. М.: Мир.
^ Wang, Mengnan; Binns, Jack; Donnelly, Mary-Ellen; Peña-Alvarez, Miriam; Dalladay-Simpson, Philip; Howie, Ross T. (13 April 2018). "High pressure synthesis and stability of cobalt hydrides" (PDF). The Journal of Chemical Physics. 148 (14): 144310. Bibcode:2018JChPh.148n4310W. doi:10.1063/1.5026535. hdl:20.500.11820/2b963cd7-cf80-42a7-8f7e-31518de1d934. ISSN 0021-9606. PMID 29655356.

[1] Химическая энциклопедия. Vol. 2. М.: Советская энциклопедия. 1990. ISBN 5-85270-035-5 – via Редкол.: Кнунянц И.Л. и др.

[2] Рипан Р., Четяну И. (1972). Неорганическая химия. Химия металлов. Vol. 2. М.: Мир.

[3] Wang, Mengnan; Binns, Jack; Donnelly, Mary-Ellen; Peña-Alvarez, Miriam; Dalladay-Simpson, Philip; Howie, Ross T. (13 April 2018). "High pressure synthesis and stability of cobalt hydrides" (PDF). The Journal of Chemical Physics. 148 (14): 144310. Bibcode:2018JChPh.148n4310W. doi:10.1063/1.5026535. hdl:20.500.11820/2b963cd7-cf80-42a7-8f7e-31518de1d934. ISSN 0021-9606. PMID 29655356.

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