Neodymium(III) bromide is an
inorganic
In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemist ...
salt of
bromine
Bromine is a chemical element with the symbol Br and atomic number 35. It is the third-lightest element in group 17 of the periodic table ( halogens) and is a volatile red-brown liquid at room temperature that evaporates readily to form a simi ...
and
neodymium
Neodymium is a chemical element with the symbol Nd and atomic number 60. It is the fourth member of the lanthanide series and is considered to be one of the rare-earth metals. It is a hard, slightly malleable, silvery metal that quickly tarnishe ...
the formula NdBr
3. The anhydrous compound is an
off-white
Shades of white are colors that differ only slightly from pure white. Variations of white include what are commonly termed off-white colors, which may be considered part of a neutral color scheme or yellow that looks like brown.
In color theo ...
to
pale green solid at room temperature, with an
orthorhombic PuBr3-type
crystal structure
In crystallography, crystal structure is a description of the ordered arrangement of atoms, ions or molecules in a crystalline material. Ordered structures occur from the intrinsic nature of the constituent particles to form symmetric patterns ...
.
The material is
hygroscopic
Hygroscopy is the phenomenon of attracting and holding water molecules via either absorption or adsorption from the surrounding environment, which is usually at normal or room temperature. If water molecules become suspended among the substan ...
[David R. Lide (Hrsg.): '' CRC Handbook of Chemistry and Physics.'' 90. Auflage. (Internet-Version: 2010), CRC Press/Taylor and Francis, Boca Raton, FL, ''Properties of the Elements and Inorganic Compounds,'' S. 4-77.] and forms a hexahydrate in water (NdBr
3· 6H
2O), similar to the related
neodymium(III) chloride.
Preparation
The direct reaction of neodymium with bromine can create neodymium(III) bromide:
:2Nd + 3Br
2 → 2NdBr
3
In the presence of
carbon
Carbon () is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—its atom making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon mak ...
,
neodymium(III) oxide
Neodymium(III) oxide or neodymium sesquioxide is the chemical compound composed of neodymium and oxygen with the formula Nd2O3. It forms very light grayish-blue hexagonal crystals. The rare-earth mixture didymium, previously believed to be an el ...
reacts with
carbon tetrabromide
Tetrabromomethane, CBr4, also known as carbon tetrabromide, is a carbon bromide. Both names are acceptable under IUPAC nomenclature.
Physical properties
Tetrabromomethane has two polymorphs: crystalline II or β below 46.9 °C (320.0 ...
to produce neodymium(III) bromide.
Structure
Neodymium(III) bromide adopts the
plutonium(III) bromide crystal structure.
The neodymium ions are 8-coordinate and adopt a
bicapped trigonal prismatic geometry.
The neodymium–bromine bond lengths are 3.07 Å and 3.09 Å.
Related compounds
Neodymium(III) bromide forms compounds with
hydrazine, such as NdBr
3·N
2H
4·2H
2O, which is a pink crystal that is soluble in water but insoluble in benzene, with d
20°C = 3.2376 g/cm
3.
Izvestii︠a︡ vysshikh uchebnykh zavedeniĭ: Khimii︠a︡ i khimicheskai︠a︡ tekhnologii︠a︡, Tập 16,Số phát hành 1
(Ivanovskiĭ khimiko-tekhnologicheskiĭ in-t, 1973), trang 181. Retrieved on December 21, 2020.
References
{{Lanthanide halides
Neodymium compounds
Bromides
Lanthanide halides