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| Names | |
|---|---|
| Other names Nickel Oxyhydroxide | |
| Identifiers | |
3D model (JSmol) | |
| ChemSpider | |
| ECHA InfoCard | 100.232.294 |
| EC Number |
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| |
| |
| Properties | |
| Ni(O)(OH) | |
| Molar mass | 91.699 g/mol |
| Appearance | black solid |
| Melting point | 230 °C (446 °F; 503 K) |
| Hazards | |
| GHS labelling:[1] | |
   | |
| Danger | |
| H302,H317,H332,H351,H410 | |
| P203,P261,P264,P270,P271,P272,P273,P280,P301+P317,P302+P352,P304+P340,P317,P318,P321,P330,P333+P317,P362+P364,P391,P405,P501 | |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Nickel oxide hydroxide is theinorganic compound with the chemical formula NiO(OH). It is a black solid that is insoluble in all solvents but attacked by base and acid. It is a component of thenickel–metal hydride battery, thenickel–iron battery, and thenickel–cadmium battery.
Nickel(III) oxides are often poorly characterized and are assumed to benonstoichiometric compounds.Nickel(III) oxide (Ni2O3) has not been verified crystallographically. For applications in organic chemistry, nickel oxides or peroxides are generated in situ and lack crystallographic characterization. For example, "nickel peroxide" (CAS# 12035-36-8) is also closely related to or even identical with NiO(OH).[1]
Its layered structure resembles that of thebrucite polymorph ofnickel(II) hydroxide, but with half as many hydrogens. The oxidation state of nickel is +3.[2] It can be prepared by the reaction of nickel(II) hydroxide with aqueouspotassium hydroxide andbromine as the oxidant:[3]
Nickel(III) oxidescatalyze the oxidation ofbenzyl alcohol tobenzoic acid using bleach:[4]
Similarly it catalyzes the double oxidation of 3-butenoic acid tofumaric acid:
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