Cp2VCl2 Niobocene dichloride is the organometallic compound with the formula (C5H5)2NbCl2, abbreviated Cp2NbCl2.

This paramagnetic brown solid is a starting reagent for the synthesis of other organoniobium compounds.

The compound adopts a pseudotetrahedral structure with two cyclopentadienyl and two chloride substituents attached to the metal.

[2] It is prepared via a multistep reaction beginning with treatment of niobium pentachloride with cyclopentadienylsodium:[3] The compound adopts a "clamshell" structure characteristic of a bent metallocene where the Cp rings are not parallel, the average Cp(centroid)-M-Cp angle being about 130.3°.

[4] Unlike the related zirconacene and titanocene dichlorides, no applications have been found for this compound, although it has been studied widely.