References in periodicals archive ?
As a [beta]-diketone, curcumin also exists as a keto-enol tautomer that chelates transition metal ions with high affinity.
The compound also exists as a keto-enol tautomer in aqueous solution that can form stable complexes stoichiometrically with transition metals including copper (II) (Kanhathaisong et al.
However, the predominant keto-enol tautomer in aprotic/apolar solvent exhibited an absorption peak at 420 nm [20].