Characterization of 4,4′-biphenylene-silicas and a chiral sensor for silicas

Abstract

The CD spectra of chiral 4,4'-biphenylene-silicas were measured and simulated using time-dependent density functional theory and a chiral sensor for silicas was developed.

Preparation of frustule-like 1,2-ethylene-silica nanospheres through a chiral amphiphile/organic solvent dual-templating approach

“…When the sol-gel transcriptions were carried out in water or mixtures of water and alcohols, a cooperation mechanism was found [37][38][39][40][41]. The interactions of chiral amphiphile and silica oligomer control the morphologies and pore architectures of the silicas and the morphologies and pore architectures of organosilicas can be simply controlled [42][43][44][45][46][47]. For the aromatic ring-bridged bis(silsesquioxanes), the circular dichroism spectra indicated that the aromatic rings stacked chirally within the walls [45].…”

Single‐Handed Helical Carbonaceous Nanotubes: Preparation, Optical Activity, and Applications

“…It has been proposed that the optical activity of aromatic ring-bridged polybissilsesquioxane nanotubes originates from chiral p-p stacking of aromatic rings, and axial chirality of biaryl groups. [5,6] …”

“…[5][6][7][8][9] The formation mechanism was a hard-templating mechanism, or a cooperation mechanism, depending on reaction conditions. When the anionic gelators L-2, D-2, LL-3, LD-3, DL-3, and DD-3 were used to prepare twisted or coiled polybissilsesquioxane tubular nanoribbons, APTMS was used as a costructure-directing agent.…”

“…When the anionic gelators L-2, D-2, LL-3, LD-3, DL-3, and DD-3 were used to prepare twisted or coiled polybissilsesquioxane tubular nanoribbons, APTMS was used as a costructure-directing agent. [5][6][7][8] The reactions were carried out in mixtures of water and ethanol. The formation of the polybissilsesquioxane tubular nanoribbons followed the cooperation mechanism.…”

“…Helical organic-inorganic hybrid silica nanofibers and nanotubes have been prepared using self-and external templating approaches, respectively. [4][5][6][7][8][9] The handedness of such nanofibers and nanotubes is determined by that of the template. Helical organic selfassemblies have been built using chiral or achiral molecules, [10][11][12] and the handedness is determined by the chirality of the building blocks and the surrounding conditions.…”