Niobium(V) chloride

Niobium pentachloride

Yellow solid with a pungent odor

Fixed

2.75 g · cm -3

208.3 ° C ( decomposition)

248.2 ° C

Violent decomposition in water

Risk

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Niobium ( V) chloride is a salt-like chemical compound consisting of the elements niobium and chlorine.

Production and representation

Niobium ( V) chloride can be obtained by reaction of niobium chloride.

It is also possible preparation by reaction of niobium ( V) oxide with thionyl chloride or carbon tetrachloride.

Properties

It is a yellow solid with a pungent odor (formation of hydrogen chloride by hydrolysis), which decomposes violently in water.

Niobium ( V) chloride forms a dimeric structure, in which each niobium atom is coordinated by six times chlorido ligand. Two chlorine atoms act as bridging ligands. There are two crystalline polymorphs of niobium ( V) chloride; in both a distorted octahedral structure is formed, wherein the pseudo- axial chlorido are arranged at an angle of approximately 84 ° to the pseudo - equatorial plane.

Use

Niobium ( V) chloride is used in the organic chemistry as the Lewis acid. It is used for example in the activation of alkenes in the carbonyl-ene reaction application.