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Niobium Chloride (NbCl5)-Powder

  • 10026-12-7
  • NbCl5
  • 411700PD
  • 99.9%
  • /
  • 233-059-8
  • Class 8
  • UN3260
  • PG III


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


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.