Influence of ortho- and meta-substituted N-heterocyclic dications towards the self-assembly of p-sulfonatocalix[4]arene

The interplay of different organic dications substituted at ortho- or meta-positions on the bis(methylene)phenyl ring and p-sulfonatocalix[4]arene, along with phosphonium cations and hydrated lanthanides affords new fascinating self-assembled structures.

Understanding the structural properties of p-xylylenebis(triphenylphosphonium) cation under different pH and anion conditions

Cis- and trans-conformers of the p-xylylenebis(triphenylphosphonium) dication can be accommodated in crystalline solids, depending on the pH of the solution and the presence of auxiliary anions (including p-sulfonatocalix[4]arene) and cations.

Efficient packing of long flexible bis-imidazolium cations in the ubiquitous bilayers of their p-sulfonatocalixarene salts

The terminally charged head groups of the bis-imidazolium dications reside in one calixarene cavity while the other only reaches the sulfonate groups of the next bilayer, with the central spacer penetrating across the multi-layers and adjusted to fit in the tight bilayer.

Illuminating host–guest cocrystallization between pyrogallol[4]arenes and the ionic liquid 1-ethyl-3-methylimidazolium ethylsulfate

Symmetry-generated packing of a cocrystal composed of c-butyl-pyrogallol[4]arene and the ionic liquid, 1-ethyl-3-methylimidazolium ethylsulfate.

Micellar transitions in catanionic ionic liquid–ibuprofen aqueous mixtures; effects of composition and dilution

Interactions between 1-dodecyl-3-methylimidazolium chloride and ibuprofen molecules in aqueous solution form catanionic mixtures, with morphologies of mixed micelles dependent on solution composition.

4-Sulfonatocalix[6]arene-induced aggregation of ionic liquids

The interaction of 4-sulfonatocalix[6]arene (SCX6) macrocycle with 1-alkyl-3-methylimidazolium type of ionic liquids possessing dodecyl, tetradecyl, or hexadecyl substituent was studied in aqueous solution at 298 K. Host-guest complexation promoted the spontaneous self-assembly into nanoparticles of 7:1 ionic liquid:SCX6 stoichiometry. Positively charged and stable nanoparticles were produced in solutions of 7-200-fold excess of ionic liquid as compared to the amount of SCX6. The negatively charged nanoparticles formed in solutions having 2-7 ionic liquid:SCX6 molar ratios evolved into larger species. The stability of the nanoparticles increased with the lengthening of aliphatic chain of the ionic liquid. Cryo-TEM experiments showed dense particles generally with spherical shape and multilayered structure, which has been confirmed by small-angle neutron scattering.