Cobalt(II) hydride

Cobalt(II) 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	60.95
Appearance	dark grey crystals
Density	0.533 g/cm³
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Cobalt 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 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 dihydride CoH₂ also crystallises in a face-centred cubic form.^[3]

Preparatiom

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

{\ce {CoCl2 + 2C6H5MgBr + 2H2 -> CoH2 + 2C6H6 + MgBr2 + MgCl2}}

References

^ Химическая энциклопедия. Vol. 2. М.: Советская энциклопедия. 1990. ISBN 5-85270-035-5. {{cite book}}: Unknown parameter |agency= ignored (help)
^ 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". The Journal of Chemical Physics. 148 (14): 144310. doi:10.1063/1.5026535. ISSN 0021-9606.

[1] Химическая энциклопедия. Vol. 2. М.: Советская энциклопедия. 1990. ISBN 5-85270-035-5. {{cite book}}: Unknown parameter |agency= ignored (help)

[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". The Journal of Chemical Physics. 148 (14): 144310. doi:10.1063/1.5026535. ISSN 0021-9606.

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