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ID 19968
Eprint ID
19968
フルテキストURL
著者
高柳 俊夫 岡山大学
本水 昌二 岡山大学
抄録
A temperature effect on ion-association reactions in an aqueous solution has been studied between nine kinds of aromatic anions and tetrabutylammonium ion (TBA(+)). The ion-association constants (K(ass)) were determined by analyzing the change in the electrophoretic mobility of anions, which was obtained by capillary zone electrophoresis, by a non-linear least-squares method. The mobility of the analyte anions decreased with increasing the amount of TBA(+) added in migrating solutions. The thermodynamic parameters in the reaction were obtained from the change in the K(ass) values by the change in temperature. The values of the entropy change (ΔS°) were positive in the ion-association reactions of all of the anions examined, being in the ranges from 5.8 to 46.1 J K(-1) mol(-1); the contribution of TΔS° in the examined ion associates to the Gibbs free-energy changes is larger than that of enthalpy changes (-ΔT°), except for phthalate ion. The results suggest that some hydrated water molecules were released in the formation of such hydrophobic ion associates, as well as in the cases of previously reported inorganic ion associates.
キーワード
Ion association
thermodynamic parameters
capillary zone electrophoresis
aromatic anions
tetrabutylammonium ion
発行日
1997-10-10
出版物タイトル
Analytical Sciences
13巻
5号
出版者
日本分析化学会
出版者(別表記)
Japan Society for Analytical Chemistry
開始ページ
783
終了ページ
789
ISSN
0910-6340
NCID
AA10500785
資料タイプ
学術雑誌論文
オフィシャル URL
http://www.journalarchive.jst.go.jp/english/jnlabstract_en.php?cdjournal=analsci1985&cdvol=13&noissue=5&startpage=783
言語
English
著作権者
日本分析化学会
論文のバージョン
publisher
査読
有り
DOI