Vanadium(III) bromide
Encyclopedia
Vanadium bromide, also known as vanadium tribromide, is VBr3. In the solid-state, this species is a polymeric
with octahedral vanadium(III) surrounded by six bromide ligands.
VBr3 has been prepared by treatment of VCl4 with HBr:
The reaction proceeds via the unstable vanadium(IV) bromide, VBr4, which releases Br2 at room temperature.
Like VCl3
, VBr3 forms red-brown soluble complexes with dimethoxyethane and THF
, such as mer-VBr3(THF)3.
Aqueous solutions prepared from VBr3 contain the salt trans-[VBr2(H2O)4]+. Evaporation of these solutions give the salt trans-[VBr2(H2O)4]Br.
Coordination polymers
A coordination polymer is an inorganic or organometallic polymer structure containing metal cation centers linked by ligands, extending in an array. It can also be described as a polymer whose repeat units are coordination complexes...
with octahedral vanadium(III) surrounded by six bromide ligands.
VBr3 has been prepared by treatment of VCl4 with HBr:
-
- 2 VCl4 + 8 HBrHydrogen bromideHydrogen bromide is the diatomic molecule HBr. HBr is a gas at standard conditions. Hydrobromic acid forms upon dissolving HBr in water. Conversely, HBr can be liberated from hydrobromic acid solutions with the addition of a dehydration agent, but not by distillation. Hydrogen bromide and...
→ 2 VBr3 + 8 HClHydrogen chlorideThe compound hydrogen chloride has the formula HCl. At room temperature, it is a colorless gas, which forms white fumes of hydrochloric acid upon contact with atmospheric humidity. Hydrogen chloride gas and hydrochloric acid are important in technology and industry...
+ Br2BromineBromine ") is a chemical element with the symbol Br, an atomic number of 35, and an atomic mass of 79.904. It is in the halogen element group. The element was isolated independently by two chemists, Carl Jacob Löwig and Antoine Jerome Balard, in 1825–1826...
- 2 VCl4 + 8 HBr
The reaction proceeds via the unstable vanadium(IV) bromide, VBr4, which releases Br2 at room temperature.
Like VCl3
Vanadium(III) chloride
Vanadium trichloride is the inorganic compound with the formula VCl3. This purple salt is a common precursor to other vanadium complexes.-Structure:...
, VBr3 forms red-brown soluble complexes with dimethoxyethane and THF
ThF
Follicular B helper T cells , are antigen-experienced CD4+ T cells found in the B cell follicles of secondary lymphoid organs such as lymph nodes, spleens and Peyer's patches, and are identified by their constitutive expression of the B cell follicle homing receptor CXCR5...
, such as mer-VBr3(THF)3.
Aqueous solutions prepared from VBr3 contain the salt trans-[VBr2(H2O)4]+. Evaporation of these solutions give the salt trans-[VBr2(H2O)4]Br.
Further reading
- Stebler, A.; Leuenberger, B.; Guedel, H. U. "Synthesis and crystal growth of A3M2X9 (A = Cs, Rb; M = Ti, V, Cr; X = Cl, Br)" Inorganic Syntheses (1989), volume 26, pages 377-85.