Counterion effect in SDS-calix[4]resorcinarene micelles.
Here we report the clouding phenomenon, conductivity, (1)H NMR spectroscopy and dynamic light scattering data of mixed sodium dodecylsulfate-calix[4]resorcinarene micellar solutions in combination with tetrabutyl-, tetraethyl-, tetramethylammonium bromides and choline chloride. The NMR data reveal tight (the binding constant is about 10(4)) guest-host binding of calix[4]resorcinarene in alkaline conditions with tetraethyl-, tetramethylammonium and choline cations. This binding occurs at rather small concentrations of the external quaternary salts (0-0.0005 M) and leads to dramatic increase of the cloud point temperature. The obtained data are discussed in the correlation with the micellar size changes, caused by the ion exchange due to the variation of quaternary salt concentrations.
Mustafina
Asiya R
AR
A.E. Arbuzov Institute of Organic and Physical Chemistry, Arbuzov street, 8, 420088 Kazan, Russia.
Zakharova
Lucia Ya
LY
Elistratova
Julia G
JG
Voronin
Mikhail A
MA
Syakaev
Victor V
VV
Konovalov
Alexander I
AI