Added Alkane Allows Thermal Thinning of Supramolecular Columns by Forming Superlattice—An X-ray and Neutron Study

Yen, Ming Huei; Chaiprapa, Jitrin; Zeng, Xiangbing; Liu, Yongsong; Cseh, Liliana; Mehl, Georg H.; Ungar, Goran

doi:10.1021/jacs.6b01172

Cited by 21 publications

(20 citation statements)

References 23 publications

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“…However it has been shown recently that addition of free alkane overcomes this obstacle and allows continuous thermal shrinkage of the(3)-columns in 12Li at moderate temperatures 42 . It was established, using labeled alkane and neutron scattering that, following dendron expulsion, the alkane collects preferentially in the resulting (2)-columns replacing the missing dendrons, effectively increasing U 2 by re-establishing the missing van der Waals bonds.…”

Section: Discussionmentioning

confidence: 99%

Molecular ejection transition in liquid crystal columns self-assembled from wedge-shaped minidendrons

et al. 2019

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Section: Discussionmentioning

confidence: 99%

Molecular ejection transition in liquid crystal columns self-assembled from wedge-shaped minidendrons

et al. 2019

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“…Further increasing the polarity of the apex substituents, as for example, by introduction of ionic groups or hydrogen bonding groups has the opposite effect and leads, as shown previously, to hexagonal columnar and micellar cubic phases (Cub sph ), even for compounds with a long rigid core (Figure 9g). [145][146][147][148][149][150][151][152] In all these cases, the segregation of the polar apex from the aromatic cores sets in, which inhibits the antiparallel side-byside packing of the aromatic cores (Figure 9f). This changes the ratio of aromatic to aliphatic cross-section areas from 2:3 to 1:3, leading to a much stronger interfacial curvature, favoring columnar and micellar self-assembly.…”

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confidence: 99%

Helical Networks of π‐Conjugated Rods – A Robust Design Concept for Bicontinuous Cubic Liquid Crystalline Phases with Achiral Ia3¯d and Chiral I23 Lattice

Dressel

Reppe

Poppe

et al. 2020

Adv Funct Materials

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Bicontinuous cubic liquid crystalline phases of π-conjugated molecules, representing self-assembled 3D-ordered interpenetrating networks with cubic symmetry, are receiving increasing attention due to their capacity for charge transport in all three dimensions and their inherent spontaneous helicity. Herein, a robust general design concept for creating bicontinuous cubic phases is reported. It is based on a nonsymmetric-substituted π-conjugated 5,5′-diphenyl-2,2′-bithiophene platform with one end containing three outfanning flexible chains and with a range of substituents at the other end (the apex). The cubic phases are stable over broad temperature ranges, often down to ambient temperature, and tolerate a wide range of apex substitution patterns, allowing structural diversity and tailoring of the cubic phase type and application-relevant properties. With an increasing number and size of apex substituents, a sequence of three different modes of cubic self-assembly is observed, following an increasing helical twist. Thus, two ranges of the achiral double network Ia3d phase range can be distinguished, a long pitch and a short pitch, with the chiral triple network I23 cubic phase in the intermediate pitch range. The findings provide a new prospect for the directed design of cubic phase-forming functional materials based on spontaneously formed helical network liquid crystals with tunable application specific properties.

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“…It has been found previously that in the simple single-tapered Li 3,4,5-tris-dodecyloxybenzoate mini-dendron (12-12-12Li)t here are also, as in 1Li and 2Li,o nly m = 3m olecules in ac olumns tratum. [51,53] The MD-annealed modelo f12-12-12Li is shown in Figure S6 alongside that of 1Li for easy comparison. In fact, 12-12-12Li is the only 12-12-12M salt whose columns do not thin down on heating, as the loss of one of its three molecules in ad iskw ould create an unsustainable void.…”

Section: Discussionmentioning

confidence: 99%

New Type of Columnar Liquid Crystal Superlattice in Double‐Taper Ionic Minidendrons

Fan

Wang

et al. 2019

Chemistry A European J

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Wedge‐shaped molecules, such as dendrons, are among the most important building blocks for directed supramolecular self‐assembly. Here we present a new approach aimed at widening the range and complexity of potential mesophases by introducing double‐tapered mesogens. Two series of compounds are presented, both alkali metal salts (Li, Na, Cs) of 3,4,5‐tris‐alkoxybenzoic acid with a second tapered tris‐alkoxyaryl group attached at the end of an alkoxy chain. The double‐tapered compounds all display an unusual hexagonal columnar phase consisting of one ionic and three non‐ionic columns per unit cell. The cation size has an unexpectedly drastic effect on unit cell size. Unlike most columnar phases, the current phases show unusually high dimensional stability on heating, and high stiffness in spite of being 80–85 % aliphatic, attributed to their molecular topology. The described approach may lead to co‐assemblies of multifunctional materials, for example, parallel p‐ and n‐semiconducting nanowires or parallel ionic and electronic conductors.

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Added Alkane Allows Thermal Thinning of Supramolecular Columns by Forming Superlattice—An X-ray and Neutron Study

Abstract: ABSTRACT:We report a columnar superlattice formed by

Cited by 21 publications

References 23 publications

Molecular ejection transition in liquid crystal columns self-assembled from wedge-shaped minidendrons

Molecular ejection transition in liquid crystal columns self-assembled from wedge-shaped minidendrons

Helical Networks of π‐Conjugated Rods – A Robust Design Concept for Bicontinuous Cubic Liquid Crystalline Phases with Achiral Ia3¯d and Chiral I23 Lattice

New Type of Columnar Liquid Crystal Superlattice in Double‐Taper Ionic Minidendrons

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