Ein lyotroper chiraler smektischer C‐Flüssigkristall mit polarem elektrooptischem Schaltverhalten

Bruckner, Johanna R.; Porada, Jan H.; Dietrich, Clarissa F.; Dierking, Ingo; Gießelmann, Frank

doi:10.1002/ange.201303344

“…Some chiral non‐amphiphilic, i. e. chromonic, lyotropic LCs were found to form chiral nematic aqueous solutions even if their linear aggregates had a 6 nm axial separation [10c] . Also lyotropic analogues of thermotropic smectic‐C phase have been observed [10d,27] . Both cases suggest communication between molecular aggregates on a finer level than just position of the aggregates.…”

Section: Discussionmentioning

confidence: 99%

Crystalline Order Propagates Across Thick Layers of Water in Solutions of Supramolecular Nanotubes

Huang

¹

,

Huang

²

,

Luo

³

et al. 2023

Chemistry A European J

0

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3D crystalline order with 1 nm resolution is observed in aqueous solutions of supramolecular nanotubes containing 94 % water, at concentrations as low as 6 wt%. 50 of star-like organic ions arrange into supramolecular rings which, in turn, stack on top of each other to form long hollow tubes with 15 nm outer diameter. Cryo-TEM and X-ray diffraction show that the parallel nanotubes arrange on a perfect hexagonal lattice. Unexpectedly, fiber diffraction on sheared solutions revealed numerous hkl Bragg reflections on several layer lines indicating longitudinal interlock between the tubes and 3D crystalline order with molecular-scale details transferred across 10 nm thick layers of water. The observed high 3D order is attributed to long-range attraction between like-charged tubes and amplified charge modulation by the extremely high intra-tube correlation length.

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Chirality Transfer from an Innately Chiral Nanocrystal Core to a Nematic Liquid Crystal: Surface‐Modified Cellulose Nanocrystals

Gonçalves

¹

,

Hegmann

²

2021

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The vast majority of nanomaterials studied in light of their ability to transmit chirality to or amplify their chirality in a surrounding medium, constitute an achiral core with chirality solely installed at the surface by conjugation or encapsulation with optically active ligands. Here we present the inverse approach focusing on surface‐modified cellulose nanocrystals (CNCs) with core chirality at both the molecular and the morphological level to quantify transmission and amplification of core chirality through space using a host nematic liquid crystal (N‐LC) as reporter. We find that CNCs functionalized at the surface with achiral molecules, structurally related to the N‐LC, exhibit better N‐LC solubility, thereby serving as highly efficient chiral inducers. Moreover, functionalization with chiral molecules only marginally enhances the efficacy of helical distortion in the host N‐LC matrix, indicating the high propensity of CNCs to transfer chirality from an inherently chiral core.

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Chirality Transfer from an Innately Chiral Nanocrystal Core to a Nematic Liquid Crystal: Surface‐Modified Cellulose Nanocrystals

Gonçalves

¹

,

Hegmann

²

2021

View full text Add to dashboard Cite

The vast majority of nanomaterials studied in light of their ability to transmit chirality to or amplify their chirality in a surrounding medium, constitute an achiral core with chirality solely installed at the surface by conjugation or encapsulation with optically active ligands. Here we present the inverse approach focusing on surface‐modified cellulose nanocrystals (CNCs) with core chirality at both the molecular and the morphological level to quantify transmission and amplification of core chirality through space using a host nematic liquid crystal (N‐LC) as reporter. We find that CNCs functionalized at the surface with achiral molecules, structurally related to the N‐LC, exhibit better N‐LC solubility, thereby serving as highly efficient chiral inducers. Moreover, functionalization with chiral molecules only marginally enhances the efficacy of helical distortion in the host N‐LC matrix, indicating the high propensity of CNCs to transfer chirality from an inherently chiral core.

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Ein lyotroper chiraler smektischer C‐Flüssigkristall mit polarem elektrooptischem Schaltverhalten

Cited by 6 publications

References 27 publications

Crystalline Order Propagates Across Thick Layers of Water in Solutions of Supramolecular Nanotubes

Crystalline Order Propagates Across Thick Layers of Water in Solutions of Supramolecular Nanotubes

Chirality Transfer from an Innately Chiral Nanocrystal Core to a Nematic Liquid Crystal: Surface‐Modified Cellulose Nanocrystals

Chirality Transfer from an Innately Chiral Nanocrystal Core to a Nematic Liquid Crystal: Surface‐Modified Cellulose Nanocrystals

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