Cobalt(II) hydride
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]
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| Other names
Cobalt dihydride, cobaltous hydride | |
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| Properties | |
| CoH2 | |
| Molar mass | 60.94888 g/mol |
| Appearance | dark grey crystals |
| Density | 0.533 g/cm³ |
| reacts | |
| Hazards | |
| Main hazards | highly reacts |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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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 + 2C6H5MgBr + 2H2 → CoH2 + 2C6H6 + MgBr2 + MgCl2
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References
- Химическая энциклопедия. 2. М.: Советская энциклопедия. Редкол.: Кнунянц И.Л. и др. 1990. ISBN 5-85270-035-5.
- Рипан Р., Четяну И. (1972). Неорганическая химия. Химия металлов. 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. doi:10.1063/1.5026535. ISSN 0021-9606.
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