Characteristic

 

Niobium(V) chloride, also known as niobium pentachloride, is a yellow crystalline solid. It hydrolyzes in air, and samples are often contaminated with small amounts of NbOCl₃. It is often used as a precursor to other compounds of niobium. 

Chemical formula：NbCl₅

Molar mass：270.17 g/mol

Appearance：yellow monoclinic crystals deliquescent

Density：2.75 g/cm³

Melting point：204.7 °C (400.5 °F; 477.8 K)

Boiling point：248.2 °C (478.8 °F; 521.3 K)

Solubility in water：decomposes

Solubility：HCl, chloroform, CCl₄

 

Application

 

It is used to form mixed chloro-aryloxide compounds, such as [Nb(OC6H3-2,6-i-Pr2)2Cl3]2, which form pyridine or phosphine adducts with a distorted six-coordinate geometry. It is also used in the preparation of pure niobium, and as an intermediate, precursor to many other laboratory reagents.        

NbCl5_MSDS.pdf