Self-Assembly of Stereoisomers ofp-tert-Butyl Thiacalix[4]arenes Tetrasubstituted at the Lower Rim by a Tertiary Amide Group with Cations of p-and d-Elements in the Organic Phase

Abstract

The ability of p-tert-butyl thiacalix [4]arenes tetrasubstituted at the lower rim by morpholide and pyrrolidide groups in cone, partial cone, and 1,3-alternate conformations to recognize cations of p-(Al 3+ , Pb 2+ ) and d-(Fe 3+ , Co 3+ , Ni 2+ , Cu 2+ , Cd 2+ , Hg 2+ ) elements has been studied by the picrate extraction method, dynamic light scattering (DLS), and atomic force microscopy (AFM). The hydrodynamic diameters of supramolecular associates, polydispersity index of host-guest systems, and molecular weight of nanoscale aggregates consisting of p-tert-butyl thiacalix[4]arenes and metal nitrates have been determined by the correlation spectroscopy method. It was shown that the investigated macrocycles are effective extractants for metal cations. All the investigated thiacalix [4]arenes are able to form dimers of about 1 nm with metal cations and nanoscale particles of 238 and 212 nm with Ni 2+ and Pb 2+ cations, respectively.

Americium and Cesium Extraction from Alkaline Media by Calix[8]arenes with p-tert-Butyl and Isononyl Substituents on the Upper Rim: Aggregation Effect

“…Известно, что функционализированные каликс [4] арены являются хорошими комплексообразователями, [9] а образование агрегатов [10][11][12] способствует росту их экстракционной способности. [13,14] Для подтверждения Таблица 3. Уравнения аппроксимирующих прямых при экстракции 137 Cs и 241 Am п-алкилкаликс [8] ранее высказанной гипотезы [6] о влиянии агрегации п-алкилкаликс [8]аренов в тетрахлорэтилене на экстракцию цезия и америция из карбонатно-щелочных сред нами были определены гидродинамические диаметры наночастиц, образуемых исследуемыми каликсаренами в органической фазе.…”

Mono-, 1,3-Di- and Tetrasubstituted p-tert-Butylthiacalix[4]arenes Containing Phthalimide Groups: Synthesis and Functionalization with Ester, Amide, Hydrazide and Amino Groups

“…The result obtained confirms the hypothesis that the aggregates similar to those described in literature are formed (Figure 2). [17][18][19][20][21] An unusual stoichiometry was observed for the complex of the compound 7 with K + cation. Two molecules of the receptor 7 bind one metal cation.…”

“…From the literature it is known that thiacalix [4]arenes can form 1:1 nanoscale aggregates with the silver cations via 'soft' bridging sulphur atoms, [17][18][19][20][21] so the formation of such complex in the case of compounds 2 and 7 can be assumed.…”

p-tert-Butyl Thiacalix[4]arene Derivatives Functionalized in the Lower Rim with Bis(3-aminopropyl)amine: Synthesis and Interaction with DNA

“…[25,[31][32][33] Thus, we believe this method can be used to monitor self-aggregation of the compounds 3 or 4 and their complexation properties toward CT-DNA.…”