Study on solute–solvent and solute–solute interactions for the dibenzo-24-crown-8-alkali metal picrate extraction system

Solvent Extraction of Sodium Permanganate by Mono-benzo 3m-Crown-m Ethers (m = 5, 6) into 1,2-Dichloroethane and Nitrobenzene: a Method which Analyzes the Extraction System with the

“…Extraction of alkali metal salts (MA) by crown compounds (L) into less-polar diluents, such as benzene, chloroform, and 1,2-dichloroethane (DCE), has been studied in more detail by considering an ion-pair formation between a complex ion ML + and a pairing anion A  in water (w) and a distribution of the thus-formed ion pairs MLA into the diluents (Takeda et al, 2004;Yajima et al, 2000). In such extraction systems, especially the extraction into DCE has been also analyzed by taking other processes into account: a distribution of M + or A  between the w-and DCE-phases, a dissociation of MLA into ML + and A  in the DCE-one, and so on (Kikuchi and Sakamoto, 2000;1998).…”

Extraction Properties of <i>p</i>-Methyloxacalix[3]arene Methyl Ether for Alkali Metal Ions

“…Consequently, the complexation of the ligand with the alkali metal ions makes only a minor contribution to the extraction selectivity, although it should be effective in enhancing the extractability of the alkali metal ions. A similar explanation may hold true for the extraction selectivity of dibenzo-24-crown-8 [17]. On the other hand, we have recently reported a more highly Cs + -selective ionophore, the 1,1,1-tris[(salicylideneamino)methyl]ethane -aluminium(III) complex, which has a rigid cavity suited for accommodating Cs + [9].…”

Evaluation of the Hydrophilic Properties of Crown Ether-ion-pair Complexes with Alkali Metal Picrates by Their Distribution into Less-polar Diluents

“…On the other hand, they seem to reflect the hydration character of M + for the other four L. In particular, this trend is remarkable for MLPic with the lighter alkali metals. 13 These results suggest that the higher hydrophobic properties of the two benzo groups in DB18C6 or DB24C8 almost cancel out the hydration effects of M + held in the L: the log KD,L values on the distribution of L into DCE were 4.139 for L = DB24C8 9 and 4.026 for DB18C6, 8,9 while it was 0.03 (Table 1) for 18C6. An effect similar to that of the benzo groups can be expected from an interaction of M + with the eight donating-oxygen atoms of DB24C8, of which the donating atoms behave like donor solvent molecules in a solution to M + .…”

“…An effect similar to that of the benzo groups can be expected from an interaction of M + with the eight donating-oxygen atoms of DB24C8, of which the donating atoms behave like donor solvent molecules in a solution to M + . 9 …”