@article{oai:miyazaki-u.repo.nii.ac.jp:00000165,
 author = {Sakai, Yukio and 境, 幸夫 and 日高, 保 and Hidaka, Tamotsu and 高木, 誠 and Takagi, Makoto and Ono, Kanako and 高木, 誠 and Takagi, Makoto and Cattrall, Robert W.},
 issue = {5},
 journal = {Bulletin of the Chemical Society of Japan},
 month = {May},
 note = {The effect of the poly(oxyethylene) (POE) chain length of ionic surfactants, expressed as C_12 H_25 -(-OCH_2CH_2-)- n OCH_2 C_6 H_3 (OH)(NO_2) (n = 2-9), on the extraction of monovalent cations, including alkali metal and tetraalkylammonium (TAA) ions, was investigated. The extraction constants (K_<ex>) with surfactants having a POE chain of n ≧6 were almost constant for each alkali metal ion. The K_<ex> sequence was Li^+ < Na^+ < Cs^+ ≦ K^+ = Rb^+. The extractability and selectivity largely decreased as n in the surfactant decreased (n < 6). The effect of the POE chain length was related to the stability of the alkali metal-POE complex. Unlike an alkali metal ion, the K_<ex> values for all TAA ions were almost constant with surfactants of n = 2-8. These facts indicated that the surfactant extracts alkali metal ions by both complex formation with its POE chain and ion-pair formation with a terminal p-nitrophenolate anion. On the other hand, TAA ions were extracted simply by ion-pair formation with a p-nitrophenolate anion of the surfactant. The proposed structures are discussed from the viewpoint of the spectrum shift of the extracted species.},
 pages = {1165--1169},
 title = {Extraction of Alkali Metal Ions and Tetraalkylammonium Ions with Ionic Surfactants Containing a Poly(oxyethylene) Chain},
 volume = {73},
 year = {2000},
 yomi = {サカイ, ユキオ and ヒダカ, タモツ and タカギ, マコト and タカギ, マコト}
}