Long‐Range Chiral Induction by a Fully Noncovalent Approach in Supramolecular Porphyrin–Calixarene Assemblies

Abstract

The hierarchical assembly, in aqueous solution, of a new multi‐metalloporphyrin/calixarene aggregate has been accomplished. In this supramolecular system transfer of chirality, from the outermost components to the central porphyrin reporter, takes place as a result of favorable and fully noncovalent long‐range electronic communication.

Association of 5,5′-Dibromo-o-Cresolsulfonphthalein Anions with Dye Cations in Aqueous Solution

“…Flattening enhances the component of noncovalent interactions due to the reduction of the distance between the corresponding fragments of interacting structures. Such properties have some squaraines, [59][60][61][62] spiropyrans, 63,64 porphyrins, 65,66 carbo-and merocyanines. [67][68][69][70] They are now being fruitfully studied in the processes of self-and heterogeneous association of dyes.…”

Composites of Silver Nanoclusters and Cellulose Nanocrystals with Tunable Emission as Multicolor Inks

“…36,37 Notably, the coassembly strategy is more convenient and flexible than the first strategy. 38,39 Various luminophores exist, including fluorescent organic dyes, metal nanoclusters, and polymers. On the other hand, CPL materials obtained by the "host−guest" mode usually exhibit strong CPL strength and higher dissymmetric factors (glum), which are crucial for their real applications.…”

“…It is well-established that the chiral environment and luminescence are two essential factors for fabricating circularly polarized luminescence (CPL)-active materials. − To date, two main strategies have been used to construct CPL systems: (1) inherent chiral luminescent materials, the chirality of which is from their asymmetric molecular or micro/nanostructure, such as chiral organic molecules, π-conjugated polymers, metal complexes, and supramolecular assemblies; − and (2) the “host–guest” binary system. In such systems, achiral luminescent guests can be encapsulated into chiral hosts by coassembly. , Notably, the coassembly strategy is more convenient and flexible than the first strategy. , Various luminophores exist, including fluorescent organic dyes, metal nanoclusters, and polymers. On the other hand, CPL materials obtained by the “host–guest” mode usually exhibit strong CPL strength and higher dissymmetric factors ( glum ), which are crucial for their real applications.…”

Amplification of weak chiral inductions for excellent control over the helical orientation of discrete topologically chiral (M3L2)npolyhedra

“…Exceptional amplification effects have often been observed in polymeric systems, particularly in the formation of helices in long-chain polymers, where the helical sense of the polymer main chain can be perfectly controlled, even when the chiral induction at every monomer unit is small. 2–4 In discrete molecular systems, however, there are only a limited number of examples where large amplification effects have been observed, 5,6 given that the incorporation of a large number of chiral sources into discrete molecular structures is usually not straightforward. In particular, chirality control over huge and complex discrete nanoarchitectures is believed to open up new concepts in the fields of material science including artificial reaction systems, sensors, and biochemical applications in higher degree of multicomponent manners.…”