Disperse Systems Based on a Dodecyl Derivative of p-Sulfonatocalix[6]arene: Self-Organization and Physicochemical Properties in a Wide Range of Concentrations and Temperatures

Abstract

Using a complex of physicochemical methods it has been shown for the first time that the diluted solutions

Self-Organization and Physicochemical Properties of Aqueous Solutions of the Sodium Salt of Azosulphonate Calix[4]arene

“…It was previously shown [6] that under UV irradiation with a wavelength of 254 nm (8 mV) of solutions of thiacalix [4]arenes in the stereoisomeric form of 1,3-alternate, containing an azoaryl group, photoisomerization around N=N bond occurs in a 30 minutes period. To study the photoisomerization of the azo-group in macrocycle 1, which is in the cone conformation, the solutions of this compound were irradiated under similar conditions [5] in the concentration range 1•10 -3 -1•10 -5 M. Comparison of the UV spectra of the solutions and the size distributions by intensity before and after irradiation throughout the studied range of concentrations and irradiation time did not reveal significant differences. Thus, macrocycle 1 is not capable of photoisomerization of the azo-group, which may be due to steric hindrances to the isomerization process due to the azoarylsulfonate groups closely spaced on one side of the macrocycle plane.…”

“…[1,2] Calixarenes, even without distinct hydrophilic and hydrophobic regions, are capable of self-organization and the formation of supramolecular assemblies of various types. [1][2][3][4][5] In the last decade, much attention has been paid to the study of the synthesis methods, properties and applications of azosulfonate calix [4] arenes (ASC) and their derivatives. [6,7] Water-soluble ASC are promising compounds that may have photo-switching properties, [8,9] which allows managing the self-organization and physicochemical properties of the substance in solution.…”

Assembling features of calixarene-based amphiphiles and supra-amphiphiles

“…280 Its corresponding calixarene, amphiphilic sulfonatocalix [4]arene 9, forms micelles with an average radius of 6.9 nm 109 and the hexameric derivative 163 forms aggregates with various sizes (radii from about 70 nm to 195 nm) depending on the concentration. 154 For positively charged surfactants, dodecylguanidine hydrochloride forms micelles as well, 281 while the amphiphilic guanidiniummodified calix [4]arene 51 is able to form SLN with an average radius of 73 nm. 117 Such great differences mainly come from their unique skeletons.…”