Niobium Chloride (NbCl5)-Powder
Product Description
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
Niobium(V) chloride is the main precursor to the alkoxides of niobium, which find niche uses in sol-gel processing. It is also the precursor to many other laboratory reagents.
In organic synthesis, NbCl5 is a specialized Lewis acid in activating alkenes for the carbonyl-ene reaction and the Diels-Alder reaction. Niobium chloride can also generate N-acyliminium compounds from certain pyrrolidines which are substrates for nucleophiles such as allyltrimethylsilane, indole, or the silyl enol ether of benzophenone.