Liquid-Liquid Partition Coefficients of β-Diketonato Complexes of Cr(III) and Pd(II) in Dodecane/(Water-Methanol Mixture) Systems

Abstract

Liquid-liquid partition coefficients (K_D) of both Cr(III) and Pd(II) complexes of several β-dlketones between dodecane and a water-methanol mixture have been determined by a combined method of batch technique and high performance liquid chromatography (HPLC). The K_D of each metal complex is enhanced as the methanol content of the mixed liquid phase decreases. In bothhomologs of the Cr(III) complexes and the Pd(II) complexes, K_D increases with an increase in the molecular size of the complex, although Cr(III) complex tends to have smaller K_D than the Pd(II) complex whose molecular size is comparable with that of the Cr complex.