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Oxalate is a dianion with the formula C2O42-. It's a bidentate ligand, meaning it can bind to a metal ion at two points. The diamagnetic correction refers to the adjustment made to the observed magnetic susceptibility of a compound containing oxalate to account for the diamagnetic contribution of the oxalate ion itself. The correction is usually small, but it can be significant if the compound contains a large number of oxalate ions.