Heat-set gels and egg-like vesicles using two component gel system based on chiral calix[4]arenes

Abstract

Chiral calix[4]arenes bearing long tertiary alkyl groups at the upper rim and S-1-phenylethylamine groups at the lower rim can form heat-set gels and egg-like vesicles enantioselectively with d-2,3-dibenzoyltartaric acid in cyclohexane, which is the first example of heat-set gels resulting from difference in interactions between two component gelators: in addition, the diameter of vesicles decreased with the increase in length of alkyl groups, which could be used to control the size of the vesicles.

First Hydrogelation of Discrete Metal Complexes. Structures and Fluxional Behavior of Cyclopalladium(II) Complexes

“…24 1,4-Bis(dimethyl-4-pyridylsilyl)benzene (L) was prepared by a method outlined in two of our previous literatures. 25 6 , and both complexes are stable in solid state. Thus, the metallacyclization is significantly affected by coligands.…”

“…[1][2][3] One aspect of particular interest is the formation of stimuli-responsive hydrogels that have potential applications such as foods, cosmetics, textile fibers, drug delivery agents, superabsorbents, and tissue engineering scaffolds. [4][5][6][7] In particular, supramolecular self-assembly through weak intermolecular interactions has been employed as a general method for the formation of task-specific hydrogels. 8,9 These weak intermolecular interactions, via intermediary water molecules, are a significant factor in hydrogelation of polymeric compounds.…”

“…FAB mass data of [(en)Pd(L)] 2 -(NO 3 ) 4 (Fig. S1) and [(tmeda)Pd(L)] 3 (NO 3 ) 6 (Fig. S2); X-ray crystal structure of [(tmeda)Pd(L)]2(PF6)4 (Fig.…”

“…S2); X-ray crystal structure of [(tmeda)Pd(L)]2(PF6)4 (Fig. S3); 1 6 along with addition of NaNO 3 (Fig. S5) …”

Bausteine mit Hohlräumen in supramolekularen Gelen

“…Zheng und Mitarbeitern [61] gelang auf diese Weise die Herstellung eines Zwei-Komponenten-Gels aus einer Hexanlösung des chiralen Calix [4]arens 8 und l-2,3-Dibenzoylweinsäure (l-9) (Abbildung 7). Unter den gleichen Bedingungen, jedoch unter Verwendung des anderen Enantiomers, d-9, entstand eine klare Lösung.…”