start-ver=1.4
cd-journal=joma
no-vol=13
cd-vols=
no-issue=5
article-no=
start-page=783
end-page=789
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1997
dt-pub=19971010
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Thermodynamic Study of Ion-Association Reactions between Aromatic Anions and Tetrabutylammonium Ion in an Aqueous Solution
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=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 (ƒĒS‹) 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 TƒĒS‹ in the examined ion associates to the Gibbs free-energy changes is larger than that of enthalpy changes (-ƒĒT‹), 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.
en-copyright=
kn-copyright=

en-aut-name=TakayanagiToshio
en-aut-sei=Takayanagi
en-aut-mei=Toshio
kn-aut-name=‚–ör•v
kn-aut-sei=‚–ö
kn-aut-mei=r•v
aut-affil-num=1
ORCID=

en-aut-name=MotomizuShoji
en-aut-sei=Motomizu
en-aut-mei=Shoji
kn-aut-name=–{…đ“ņ
kn-aut-sei=–{…
kn-aut-mei=đ“ņ
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=‰ŠŽR‘åŠw

affil-num=2
en-affil=
kn-affil=‰ŠŽR‘åŠw
en-keyword=Ion association
kn-keyword=Ion association
en-keyword=thermodynamic parameters
kn-keyword=thermodynamic parameters
en-keyword=capillary zone electrophoresis
kn-keyword=capillary zone electrophoresis
en-keyword=aromatic anions
kn-keyword=aromatic anions
en-keyword=tetrabutylammonium ion
kn-keyword=tetrabutylammonium ion
END