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Reference.org
Sodium cyclopentadienide
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<p>Sodium cyclopentadienide is an <a href="/facts/Organosodium_compound/4raxp9E1">organosodium compound</a> with the <a href="/facts/Chemical_formula/hghUtthl">formula</a> C5H5Na. The compound is often abbreviated as NaCp, where Cp− is the cyclopentadienide anion. Sodium cyclopentadienide is a colorless solid, although samples often are pink owing to traces of oxidized impurities. </p>