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Reference.org
Niobocene dichloride
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<p>Niobocene dichloride is the <a href="/facts/Organometallic_compound/bhqFz2P0">organometallic compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> (C5H5)2NbCl2, abbreviated Cp2NbCl2. This <a href="/facts/Paramagnetic/vj1SMbbp">paramagnetic</a> brown solid is a starting reagent for the synthesis of other organoniobium compounds. The compound adopts a pseudotetrahedral structure with two <a href="/facts/Cyclopentadienyl/2cw59tjx">cyclopentadienyl</a> and two chloride substituents attached to the metal. A variety of similar compounds are known, including <a href="/facts/Titanocene_dichloride/4sGXUdHd">Cp2TiCl2</a>. </p>