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NAOSITE : Nagasaki University's Academic Output SITE > 060 工学部・工学研究科 > 060 紀要 > 長崎大学工学部研究報告 > 第11号 >

Spectroscopic Evidence for the Formation of "Hydrophobic Ion Pairs"


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タイトル: Spectroscopic Evidence for the Formation of "Hydrophobic Ion Pairs"
著者: Shinkai, Seiji / Manabe, Osamu
発行日: 1978年 7月
出版者: 長崎大学工学部 / Faculty of Engineering, Nagasaki University
引用: 長崎大学工学部研究報告, (11), pp.115-120; 1978
抄録: The optical spectra of picrate ions, which have been employed to evaluate the tightness of ion pairs in organic solvents, were taken in aqueous micelles (CTAB, SDS, and Brij-35) and cationic polysoaps, and were compared with those in organic solvents. The spectrum (Amax 355 nm in water) was hardly affected by the addition of anionic (SDS) and nonionic (Brij-35) surfactants above the cmc's and by a cationic polysoap with no dodecyl-group content (4VP-D-0). On the other hand, the addition of a cationic surfactant (CTAB) above the cmc and cationic polysoaps with high dodecyl-group contents (4VP-D-22 and EVI-D-41) gave rise to significant bathochromic shifts which were accompanied with a new absorption maximum at around 410 nm. It was suggested, based on the analogy with the spectra in organic solvents, that picrate ions form "hydrophobic ion pairs" with cationic surfactans such as CTAB, 4VP-D-22, and EVI-D-41, but the ion pairs in the hydrophobic region are not free as in dipolar aprotic solvents. Interestinly, the formation of a free ion pair with CTAB was observed slightly below the cmc.
URI: http://hdl.handle.net/10069/23932
ISSN: 02860902
資料タイプ: Departmental Bulletin Paper
原稿種類: publisher
出現コレクション:第11号

引用URI : http://hdl.handle.net/10069/23932

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