Chirality induction on non-chiral dye-linked polysilsesquioxane in nanohelical structures

Abstract

<p>Chirally arranged organic dye-linked polysilsesquioxane was prepared, through a sol–gel transcription using its non-chiral precursor with a chiral supramolecular template, and its chiroptical properties were investigated.</p>

Chirality induction to achiral molecules by silica‐coated chiral molecular assemblies

“…This suggests that PSA inside the surfactant assembly can form stacked dimers. Induced CPL (ICPL) originating from these excimers is clearly distinguished from the contribution of the monomer (Figure 5A), making this system one of the rare showing CPL from intermolecular excimers based on nonchiral chromophores 32–34 . For PTCTK , we can clearly see two peaks, one at 486 nm and the other around 525 nm.…”

Supramolecular Induction of Topological Chirality from Nanoscale Helical Silica Scaffolds to Achiral Molecular Chromophores

“…Other studies showed that chiroptical properties could appear upon chiral aggregation of molecules devoid of optical activity in solution. − Tsunega et al have recently reported the use of cationic polymer–anionic chiral counterion assemblies as templates to prepare silica architectures that can induce chiroptical signals to adsorbed dyes and nanocrystals. , Silica with chiral molecular prints has also been used for enantioselective separation/recognition − and has been shown to have the ability to induce chiral arrangement to the achiral molecules adsorbed on its surface . Our previous work has shown that it is possible to induce chiroptical properties to gold nanoparticles or metal complexes organized on the surface of silica nanohelices , or using biphenyl-linked polysilesquioxane through a sol–gel transcription of self-assembled nanohelices from dicationic gemini surfactants. We now show that this method can be generalized for achiral molecular chromophores that are covalently linked to the macroscopic chiral template.…”

“…13,14 Silica with chiral molecular prints has also been used for enantioselective separation/recognition 15−17 and has been shown to have the ability to induce chiral arrangement to the achiral molecules adsorbed on its surface. 18 Our previous work has shown that it is possible to induce chiroptical properties to gold nanoparticles or metal complexes organized on the surface of silica nanohelices 19,20 or using biphenyl-linked polysilesquioxane 21 through a sol−gel transcription of selfassembled nanohelices from dicationic gemini surfactants. We now show that this method can be generalized for achiral molecular chromophores that are covalently linked to the macroscopic chiral template.…”

High-Efficiency Circularly Polarized Luminescence from Twisted Tetraarylethylene-Bridged Polybissilsesquioxane Nanotubes

“…They are comparable to those of TPES-M(P) 39 and TS-L(D) 40 prepared using BTSTPE as the silica source and higher than those of biphenyl-linked polysilsesquioxanes (|g lum | = 2.1 × 10 −4 ). 53…”