Distribution of Thenoyltrifluoroacetone and Its Scandium Chelate in Ketone Solvent System

Abstract

The distribution equilibria of thenoyltrifluoroacetone (TTA) and its scandium chelate between aqueous solutions with an ionic strength of 0.1 and ketones at 25°C have been studied. The distribution of TTA was correlated with the solubility parameters of the ketones and the correlation between the distribution coefficients of TTA and those of scandium chelate was confirmed. The characteristic properties of ketones were discussed in comparison with those of other oxygen containing solvents.

Role of Tf2N− anions in the ionic liquid–water distribution of europium(iii) chelates

“…The value for the tta À concentration in the aqueous phase can be calculated as follows: Table 1. The K ex,3 values in the organic solvent systems were calculated from the distribution data in the respective references for DIPE, 46 MIBK, 47,48 benzene, 46 and DCE. 49 Additionally, the two-phase stability constant, K D,M b 3 , can be calculated from the K ex,3 value as follows:…”

“…The calculated K D,M b 3 values are shown in Table 1. Given that b-diketones exist in solution, including IL solutions, as a mixture of the keto and enol forms, the distribution constant of the enol form (K D,HE ) as a proton complex in various solvents was calculated 27,46,48,49 and used for the discussion. The distribution constant of a solute, expressed on the mole fraction scale ðK D Þ, can be written using a modied equation based on the regular solution theory: 51,52 ln K…”

“…chelate in [C n mim][Tf 2 N] and various organic solvents including benzene, DCE, DIPE, and MIBK[46][47][48][49]59 along with the enol form of Htta as a proton complex. Because of the lack of a reliable value of b 3 for Eu(tta)3 , the K D;M b 3 value was used instead of K D;M for the subsequent discussion.…”