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Reference.org
Cyclopentadienylindium(I)
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<p>Cyclopentadienylindium(I), C5H5In, is an <a href="/facts/Organoindium_compound/bGh2jTpj">organoindium compound</a> containing <a href="/facts/Indium/zRq3stVb">indium</a> in the +1 oxidation state. Commonly abbreviated to CpIn, it is a <a href="/facts/Cyclopentadienyl_complex/rezSmzLI">cyclopentadienyl complex</a> with a <a href="/facts/Half_sandwich_compound/vu6MyRNq">half-sandwich</a> structure. It was the first (1957) low-valent organoindium compound reported. </p>