The Nature of Aqueous Solutions of a Cationic Calix[4]arene: A Comparative Study of Dye–Calixarene and Dye–Surfactant Interactions

Sensors

N. O. Mchedlov-PetrossyanL. N. Vilkova¹  N. A. Vodolazkaya²  A. G. Yakubovskaya²  R. V. Rodik²  V. I. Boyko² 

[1] id="af1-sensors-06-00962">Department of Physical Chemistry, Kharkov National University, 61077, Kharkov, Ukraine; Institute of Organic Chemistry, National Academy of Science of Ukraine, 02094, Kiev, Ukrai

关键词: Cationic water-soluble calix[4]arene;    Indicator dye;    Ionization constant;   

DOI  :  10.3390/s6080962

来源: mdpi

【 摘 要 】

Among different types of calixarenes, the water–soluble ones are of especial interest because of their possible applications in biochemical research. In order to elucidate the nature of aqueous solutions of a cationic amphiphilic calixarene, substituted tetrapropoxy-calix[4]arene bearing hydrophilic choline groups at the upper rim, we studied vis–spectroscopically the influence of the above system on the acid–base behavior of three indicator 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,values against the ‘aqueous’ ones appeared to be very similar in aqueous solutions of both calix[4]arene and cationic surfactant. A conclusion can be made about aggregation (or association), i.e., micelle formation of the cationic calix[4]arene under study.

【 授权许可】

Unknown   
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