Bismuth tribromide

• Bismuttribromid
• Tribrombismutin

Orange -yellow solid

Fixed

5.7 g · cm -3 ( 25 ° C)

218 ° C

461 ° C

• Reacts with water
• Soluble in hydrochloric acid, hydrobromic acid and ethanol

Risk

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Bismuth ( III ) bromide is an inorganic chemical compound of the bismuth from the group consisting of bromides.

Production and representation

Bismuth (III) bromide, can be obtained by reaction of bismuth with bromine at 250 ° C.

Properties

Bismuth ( III ) bromide is a hygroscopic, yellow to orange- yellow, crystalline solid which reacts with water to Bismutoxidbromid. It has a monoclinic crystal structure with space group P21 / c. In the molten state, the connection is deep red. In the gaseous state, the structure is pyramidal. In the solid state, there are two forms with a transition temperature of 158 ° C. The low temperature form α - bismuth ( III ) bromide has a distorted octahedral structure with three short BiBr6 and three long bi- Br bonds. The high-temperature form is isotypic structure of aluminum chloride. The bismuth compound can be reduced to bismuth ( I) bromide.

Use

Bismuth ( III ) bromide may be used as catalyst for the formation of cyclic carbonates, which are important starting materials for polycarbonates, and other polymeric materials. It can also be used as a catalyst for further organic syntheses.