Sodium hypobromite

Sodium hypobromite
Names
	IUPAC name Sodium hypobromite
Identifiers
CAS Number	13824-96-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	146053;
ECHA InfoCard	100.034.096
EC Number	237-520-4;
PubChem CID	23673712;
UNII	ZU61C4V8RA ;
CompTox Dashboard (EPA)	DTXSID40930039 ;
	InChI InChI=1S/BrO.Na/c1-2;/q-1;+1 Key: CRWJEUDFKNYSBX-UHFFFAOYSA-N;
	SMILES [O-]Br.[Na+];
Properties
Chemical formula	NaBrO
Molar mass	118.893 g·mol−1
Appearance	orange solid
Related compounds
Other anions	Sodium bromide; Sodium bromite; Sodium bromate; Sodium perbromate;
Related compounds	Hypobromous acid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Sodium hypobromite is an inorganic compound with the chemical formula NaBrO. It is a sodium salt of hypobromous acid. It consists of sodium cations Na⁺ and hypobromite anions ⁻OBr. It is usually obtained as the pentahydrate, so the compound that is usually called sodium hypobromite actually has the formula NaOBr·5H₂O. It is a yellow-orange solid that is soluble in water. It adopts a monoclinic crystal structure with a Br–O bond length of 1.820 Å.^[1] It is the bromine analogue of sodium hypochlorite, the active ingredient in common bleach. In practice the salt is usually encountered as an aqueous solution.

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Sodium hypobromite arises by treatment of aqueous solution of bromine with sodium hydroxide:^[2]

Br₂ + 2 NaOH → NaBr + NaOBr + H₂O

It can be prepared in situ for use as a reagent, such as in the synthesis of 3-aminopyridine from nicotinamide^[3] (via the Hofmann rearrangement).

Sodium hypobromite solutions must be prepared fresh since the compound slowly disproportionates to sodium bromide and sodium bromate:

3 NaOBr → 2 NaBr + NaBrO₃

References