Nickel oxide hydroxide

Nickel oxide hydroxide is the inorganic 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 the nickel-metal hydride battery and of the nickel–iron battery.

Nickel oxide hydroxide
NiOOHtopCrop.tif
NiOOHsideCrop.tif
Names
Other names
Nickel Oxyhydroxide
Identifiers
CAS Number
  • 12026-04-9 check
3D model (JSmol)
  • Interactive image
PubChem CID
  • 16684208
InChI
  • InChI=1S/Ni.H2O.O/h;1H2;/q+1;;/p-1
    Key: VUFYPLUHTVSSGR-UHFFFAOYSA-M
SMILES
  • O[Ni]=O
Properties
Chemical formula
Ni(O)(OH)
Molar mass91.699 g/mol
Appearanceblack solid
Melting point230 °C (446 °F; 503 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Related materialsEdit

Nickel(III) oxides are often poorly characterized and are assumed to be nonstoichiometric 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]

Synthesis and structureEdit

Its layered structure resembles that of the brucite polymorph of nickel(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 aqueous potassium hydroxide and bromine as the oxidant:[3]

2 Ni(OH)2 + 2 KOH + Br2 → 2 KBr + 2 H2O + 2 NiOOH

Use in organic chemistryEdit

Nickel(III) oxides catalyze the oxidation of benzyl alcohol to benzoic acid using bleach:[4]

Nickel oxide hydroxide oxidation of benzyl alcohol

Similarly it catalyzes the double oxidation of 3-butenoic acid to fumaric acid:

Nickel oxide hydroxide oxidation of 3-butenoicid


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 Metasyntactic variable, which is released under the 
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