Abstract: Among different types of calixarenes, the water–soluble ones are of especial interestbecause of their possible applications in biochemical research. In order to elucidate the natureof aqueous solutions of a cationic amphiphilic calixarene, substituted tetrapropoxycalixarene bearing hydrophilic choline groups at the upper rim, we studied vis–spectroscopically the influence of the above system on the acid–base behavior of threeindicator dyes, namely, 2,4-dinitrophenol, bromophenol blue, and N,N/-dioctadecylrhodamine,at constant ionic strength of 0.05 M, maintained with NaCl addition. Simultaneously,‘apparent’ ionization constants, Kaa , of the same dyes were determined in the presence ofcommon cationic surfactant micelles. Within the concentration range from 1.0×10–5 to 0.01 M,the aforementioned water–soluble calixarene displays effects similar to those of micelles ofcetyltrimethylammonium bromide (or chloride). The shifts of the absorption and emissionbands in the visible region, as well as the alterations of the Kaa values against the ‘aqueous’ones appeared to be very similar in aqueous solutions of both calixarene and cationicsurfactant. A conclusion can be made about aggregation (or association), i.e., micelleformation of the cationic calixarene under study.
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Mchedlov-Petrossyan, N.O.; Vilkova, L.N.; Vodolazkaya, N.A.; Yakubovskaya, A.G.; Rodik, R.V.; Boyko, V.I.; Kalchenko, V.I. The Nature of Aqueous Solutions of a Cationic Calixarene: A Comparative Study of Dye–Calixarene and Dye–Surfactant Interactions. Sensors 2006, 6, 962-977.
Mchedlov-Petrossyan NO, Vilkova LN, Vodolazkaya NA, Yakubovskaya AG, Rodik RV, Boyko VI, Kalchenko VI. The Nature of Aqueous Solutions of a Cationic Calixarene: A Comparative Study of Dye–Calixarene and Dye–Surfactant Interactions. Sensors. 2006; 6(8):962-977.
Mchedlov-Petrossyan, N. O.; Vilkova, L. N.; Vodolazkaya, N. A.; Yakubovskaya, A. G.; Rodik, R. V.; Boyko, V. I.; Kalchenko, V. I. 2006. "The Nature of Aqueous Solutions of a Cationic Calixarene: A Comparative Study of Dye–Calixarene and Dye–Surfactant Interactions." Sensors 6, no. 8: 962-977.