Abstract
Abstract Concentration equilibrium constants of benzoyl-thiobenzoylmethane (SdbmH) complexes of bivalent magnesium, cobalt, nickel, copper and zinc have been measured in 75% (v/v) aqueous dioxane containing 0.05 m sodium perchlorate. The values for the transition metal ions are greater than those of dibenzoylmethane (dbmH) complexes measured under the same conditions, although the pK value of SdbmH is smaller than that of dbmH. Contribution of dπ–dπ interaction seems to be responsible for such an unusual relationship.
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