start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=311
end-page=315
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1998
dt-pub=19980410
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Equilibrium Study on the Ion Association of Monovalent and Divalent Naphtholsulfonates with Tetrabutylammonium Ion in an Aqueous Solution by Capillary Zone Electrophoresis
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The ion-association properties of monovalent and divalent naphtholsulfonate ions were investigated with tetrabutylammonium ion (TBA(+)) as a pairing ion in an aqueous solution. The ion-association constants were obtained by analyzing the change in the electrophoretic mobility of naphtholsulfonate ions in the presence of TBA+ by capillary zone electrophoresis; also, the contribution of a hydroxyl group to the ion associability of monovalent and divalent naphtholsulfonate ions, as well as the electrophoretic mobility of the ions, was investigated. The obtained ion-association constants indicate that the positional isomers possessing anionic groups at the β-position of the naphthalene ring are more associable with TBA(+) than those at the α-position, and that the ion associability of the divalent naphtholsulfonates is larger than those of the monovalent ones, except for 1-naphthol-2-sulfonate. The abnormal associability of 1-naphthol-2-sulfonate can be explained by a synergistic increase in the hydrophilicity of the divalent ion. The difference in the ion associability between the monovalent and divalent naphtholsulfonates, 0.16 in log unit on the average, was smaller than that between the naphthalenesulfonate and naphthalenedisulfonate ions, 0.30 log unit on the average. The electrophoretic mobility of the naphtholsulfonate ions obtained in the absence of TBA(+) is compared with each other, and the contribution of the hydroxyl group is discussed on the basis of the hydration behavior of the naphtholsulfonates.
en-copyright=
kn-copyright=

en-aut-name=TakayanagiToshio
en-aut-sei=Takayanagi
en-aut-mei=Toshio
kn-aut-name=高柳俊夫
kn-aut-sei=高柳
kn-aut-mei=俊夫
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=OhbaYoshitaka
kn-aut-sei=Ohba
kn-aut-mei=Yoshitaka
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=HarukiHiroko
kn-aut-sei=Haruki
kn-aut-mei=Hiroko
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=WadaEiko
kn-aut-sei=Wada
kn-aut-mei=Eiko
aut-affil-num=4
ORCID=

en-aut-name=MotomizuShoji
en-aut-sei=Motomizu
en-aut-mei=Shoji
kn-aut-name=本水昌二
kn-aut-sei=本水
kn-aut-mei=昌二
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=岡山大学

affil-num=2
en-affil=
kn-affil=岡山大学

affil-num=3
en-affil=
kn-affil=岡山大学

affil-num=4
en-affil=
kn-affil=岡山大学

affil-num=5
en-affil=
kn-affil=岡山大学
en-keyword=Ion association
kn-keyword=Ion association
en-keyword=aqueous solution
kn-keyword=aqueous solution
en-keyword=naphtholsulfonate
kn-keyword=naphtholsulfonate
en-keyword=capillary zone electrophoresis
kn-keyword=capillary zone electrophoresis
en-keyword=tetrabutylammonium ion
kn-keyword=tetrabutylammonium ion
END