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Reference.org
Transition metal oxalate complex
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<p>Transition metal oxalate complexes are <a href="/facts/Coordination_complex/1tCyeQUm">coordination complexes</a> with <a href="/facts/Oxalate/u0Gdem0A">oxalate</a> (C2O42−) <a href="/facts/Ligand/6etB3qeW">ligands</a>. Some are useful commercially, but the topic has attracted regular scholarly scrutiny. Oxalate (C2O42-) is a kind of dicarboxylate ligand. As a small, symmetrical dinegative ion, oxalate commonly forms five-membered MO2C2 chelate rings. Mixed ligand complexes are known, e.g., [Co(C2O4)(NH3)4]κ+. </p> Structures of some metal oxalate complexes