 | |
 Anhydrous | |
 Hexahydrate | |
| Names | |
|---|---|
| IUPAC name Nickel(II) bromide | |
| Other names Nickel dibromide, Nickel bromide, Nickelous bromide | |
| Identifiers | |
| |
3D model (JSmol) | |
| ChemSpider |
|
| ECHA InfoCard | 100.033.318 |
| EC Number |
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| UNII | |
| UN number | 3288 (NICKEL BROMIDE) |
| |
| |
| Properties | |
| NiBr2 | |
| Molar mass | 218.53 g/mol |
| Appearance | yellow-brown crystals |
| Odor | odorless |
| Density | 5.10 g/cm3[1] |
| Melting point | 963 °C (1,765 °F; 1,236 K) sublimes[1] |
| 1.13 kg/L (0 °C) 1.22 kg/L (10 °C) 1.31 kg/L (20 °C)[1] 1.44 kg/L (40 °C) 1.55 kg/L (100 °C)[2] | |
| Band gap | 2.5 eV[3] |
| +5600.0·10−6 cm3/mol[4] | |
| Structure[5] | |
| hexagonal,hR9 | |
| R3m, No. 166 | |
a = 0.36998 nm,c = 1.82796 nm | |
Formula units (Z) | 3 |
| Thermochemistry[6] | |
Std enthalpy of formation(ΔfH⦵298) | −212.1 kJ·mol−1 |
| Hazards | |
| Occupational safety and health (OHS/OSH): | |
Main hazards | Irritant, corrosive |
| GHS labelling:[7] | |
  | |
| Danger | |
| H317,H334,H341,H350i,H360D,H372,H410 | |
| P203,P233,P260,P264,P270,P271,P272,P273,P280,P284,P302+P352,P304+P340,P318,P319,P321,P333+P317,P342+P316,P362+P364,P391,P403,P405,P501 | |
| NFPA 704 (fire diamond) | |
| Flash point | Non-flammable |
| Related compounds | |
Otheranions | nickel(II) fluoride nickel(II) chloride nickel(II) iodide |
Othercations | cobalt(II) bromide copper(II) bromide palladium(II) bromide |
Except where otherwise noted, data are given for materials in theirstandard state (at 25 °C [77 °F], 100 kPa). | |
Nickel(II) bromide is the name for theinorganic compounds with the chemical formula NiBr2(H2O)x. The value ofx can be 0 for the anhydrous material, as well as 2, 3, or 6 for the three knownhydrate forms. The anhydrous material is a yellow-brown solid which dissolves inwater to give blue-green hexahydrate (see picture).
The structure of the nickel bromides varies with the degree of hydration. In all of these cases, the nickel(II) ion adopts anoctahedral molecular geometry. Similar structures are observed in aqueous solutions of nickel bromide.[8]
NiBr2 hasLewis acid character, as indicated by its tendency to hydrate and form adducts with a variety of other Lewis bases.
NiBr2 is also used to prepare catalysts forcross-coupling reactions and variouscarbonylations.[9] NiBr2-glyme shows increased activity compared to NiCl2-glyme for some transformations.[11]
