Vanadium(III) bromide

Vanadiumtribromid

Black solid

Fixed

4.0 g · cm -3 ( 20 ° C)

Soluble in water

Risk

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Vanadium ( III) bromide, is an unstable chemical bond of the vanadium from the group consisting of bromides.

Production and representation

Vanadium (III ) bromide (IV) can be obtained with hydrobromic acid chloride by the reaction of vanadium with intermediate unstable vanadium (IV ) bromide formed.

Also possible is the preparation by reaction of bromine with vanadium or Ferrovanadium.

Properties

Vanadium (III ) bromide is in the form of black, foliated, very hygroscopic crystals with sometimes a greenish sheen. Is soluble in water with green color. Its crystal structure is isotypic to that of vanadium ( III) chloride with the space group R3c (a = 6.400 Å, c = 18.53 Å). When heated to temperatures around 500 ° C, a violet gas phase, from which, under suitable conditions of rapid cooling, red, disintegrating already at -23 ° C and vanadium (IV) bromide, can be deposited.

Vanadium ( III) bromide, decomposes on contact with air, light or moisture to vanadium, vanadium oxide and hydrogen bromide. As well as vanadium ( III) chloride obtained vanadium (III ) bromide with dimethoxyethane and THF reddish brown soluble complex compounds.