NIOBIUMCHLORIDE Property

Melting point:

decomposes at 800℃ [CRC10]

Boiling point:

456.21°C (estimate)

Density 

3.200

solubility 

reacts with H2O

form 

violet-black monoclinic crystals

color 

violet-black monoclinic crystals, crystalline

Water Solubility 

reac H2O [CRC10]

EPA Substance Registry System

Niobium chloride (NbCl4) (13569-70-5)

Hazard and Precautionary Statements (GHS)

NIOBIUMCHLORIDE Chemical Properties,Usage,Production

Chemical Properties

Brown-black crystal needles; pure brown in transmitted light.
Decomposes on exposure to air and moisture (color change first to black, then to white). Dissolves in a small amount of H2O and in dilute hydrochloric acid, giving a dark-blue solution.

Preparation

Reduction of NbCl5 with H2 at 2 atm. (generated when the tube is filled at STP, sealed and then heated). The reaction does not go to completion and NbCl5 and NbCl4 must be separated by sublimation.