Responsive Supramolecular Gels Constructed by Crown Ether Based Molecular Recognition

Abstract

Responsive supramolecular gels were constructed from crown ether terminated four-arm star poly(epsilon-caprolactone) (PCL-DB24C8) and dibenzylammonium-terminated two-arm PCL-DBAS (see scheme), exploiting the formation of pseudorotaxane linkages between crown ether and ammonium moieties. The resultant supramolecular gels exhibit thermo- and pH-induced reversible gel-sol transition.

Engineering Solid‐State Molecular Switches: N‐Salicylidene N‐Heterocycle Derivatives

“…[13] This diversity of interactions explains the complexity of supramolecules which can be either artificial (nanogrids, [14][15][16] nanoracks, [17] nanocages [18] ) or natural [19] (DNA, recognition proteins). Supramolecular interactions can be very stable (thermodynamic) or very labile (kinetic), [20] which allows the system to (re)organize either itself [21] or under a given constraint (temperature, [21] light irradiation, [10,22] pH [23] and solvent change, [21] concentration [21] ) to form complex self-assemblies. The self-reorganization ability of supramolecular systems plays also an important role in molecular recognition encountered in some host-guest complexes.…”

Synthesis of poly(ethylene glycol) functionalized star-shaped tricationic imidazolium based ionic liquid

“…Ether Tosylate (mPEG 750 -pTs, 1) mPEG 750 -pTs was prepared according to literature procedures [51,52] . For example, into a round-bottom flask equipped with a magnetic stirring bar, mPEG 750 (8.0 g, 10.7 mmol), p-TsCl (8.1 g, 42.7 mmol), and dry CH 2 Cl 2 (50 mL) were charged.…”

Supramolecular main-chain liquid crystalline polymers and networks with competitive hydrogen bonding: a study of rigid networking agents in supramolecular systems

“…Supramolecular chemistry, specifically hydrogen bonding, has also been applied to the field of polymer formation and modification. A body of work has been generated involving the formation of networks and polymers using multiple hydrogen bonds [31][32][33]. The structural integrity of the supramolecular systems often exceeds that of the analogous covalent species [31].…”