Niobium(IV) chloride

Niobtetrachlorid

Black solid

Fixed

3.14 g · cm -3

275 ° C ( sublimation)

800 ° C ( decomposition)

Reacts with water

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Niobium ( IV) chloride is an inorganic chemical compound of niobium from the group of chlorides.

Production and representation

Niobium ( IV) chloride can be obtained by reacting niobium with niobium ( V) chloride.

Instead of niobium can be reduced niobium ( V) chloride and iron, aluminum ( distilling aluminum (III ) chloride in a vacuum) or hydrogen.

Properties

Niobium (IV ) chloride is in the form of brown-black, shiny needles in front of which are falling apart under pressure. It is diamagnetic, very air-sensitive and soluble in little water or dilute hydrochloric acid with a deep blue color. It has a monoclinic crystal structure with space group C2 / m (a = 1232 pm, b = 682 pm, c = 821 pm, β = 134 °). The compound is in the form of edge- sharing octahedra NbCl2Cl4 / 2 ago .. In the short chains (303 pm ) and long switch ( 379 pm ) Nb -Nb distances from. The short distances indicate a certain covalent bond share of Nb ( IV ) atoms ( electron configuration d1).