The role of hydrogen bonding in the phase behaviour of supramolecular liquid crystal dimers

Martínez‐Felipe, Alfonso; Imrie, Corrie T.

doi:10.1016/j.molstruc.2015.07.062

Cited by 98 publications

(52 citation statements)

References 53 publications

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“…A “bent” molecular structure is a prerequisite, with the thermal stability of the N TB phase showing a strong dependence on the intermesogen angle . The twist‐bend phase is most commonly observed in methylene linked dimers with odd spacer parity, notable exceptions being bent‐core systems, ether‐linked dimers, trimers, oligomers and polymers . Concerning dimers and bimesogens, the largest sub‐group to exhibit the twist‐bend nematic phase are methylene‐linked with a nonamethylene spacer and mesogenic units constructed from two rigid cyclic units, with around 40 materials known in total .…”

Section: Resultsmentioning

confidence: 99%

“…[25] Initially,i tw as believed that this mesophase was only found in methylene-linked dimers. However,o bservations of the N TB phase in bent-core systems, [8] ether-linked dimers, [26,27] trimers, [28][29][30][31] oligomers [32] and even polymers [33] hint at this mesophase being universal rather than what was perhaps first thought. Ac omprehensive structurep roperty relationship remains elusive despite the ever growing number of compounds reported in the literature to exhibit this mesophase.…”

Section: Introductionmentioning

confidence: 99%

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Does Topology Dictate the Incidence of the Twist‐Bend Phase? Insights Gained from Novel Unsymmetrical Bimesogens

Mandle

Goodby

2016

Chemistry A European J

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We prepared a significant number of unsymmetrical liquid‐crystalline dimers that exhibit the twist‐bend nematic phase; a state of matter that exhibits spontaneous breaking of mirror symmetry and, for some materials, a microsecond electrooptic response. A number of novel unsymmetrical bimesogens were synthesized and in comparing their thermal behaviour to previous literature examples, we have uncovered an unexpected relationship between the thermal stability of the nematic and NTB phases. This relationship demonstrates that molecular shape dictates the incidence of this fascinating phase of matter and leads us to speculate as to the existence of “twist‐bend nematic phases” on length scales beyond those of the molecule.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Does Topology Dictate the Incidence of the Twist‐Bend Phase? Insights Gained from Novel Unsymmetrical Bimesogens

Mandle

Goodby

2016

Chemistry A European J

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“…), allowing ultimately for engineering of desired functions into the assembled structure . Following this approach, several supramolecular complexes (SCPs) have been designed as potential components in electrolytes for advanced electrochromic devices, by the combination of metal ions, such as alkali metal ions, and ionogens, such as carboxylic and sulfonic acid groups . Various materials containing LCs have been synthesized recently with the aim of controlling their electronic transmission properties through the formation of anisotropic morphologies …”

Section: Introductionmentioning

confidence: 99%

Supramolecular complexes based on liquid‐crystalline polysiloxanes and copper phthalocyanine

Kong

Song

Bai

et al. 2018

Polymer International

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Self‐assembly of mesogens in one polymer system reflects the capability for integrating intermolecular interactions and functions of materials. A series of novel supramolecular complexes (SCPs) containing cholesterol derivatives, siloxane backbone and copper phthalocyanine were synthesized. The SCPs were made from sulfonic acid‐containing precursor polymers (SAPs) synthesized by the use of 4‐(allyloxy)benzenesulfonic acid, cholest‐5‐en‐3‐ol‐(3β)‐4‐(allyloxy)benzoate and polymethylhydrosiloxane. Differential scanning calorimetry, polarizing optical microscopy and X‐ray diffraction results confirmed the mesomorphic properties. The SAPs showed smectic phase, but the SCPs showed columnar phase due to more lateral copper phthalocyanine groups in the polymer systems. Moreover, because of rigid side groups and cholesteric polymer, SCPs showed greater d‐spacings between the side mesogenic groups and exhibited very good electrical conductivity. © 2018 Society of Chemical Industry

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“…LC dimers have now attracted considerable research interest over a prolonged period, [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] not only because they can be used as models of thermotropic, semi-flexible main chain liquid crystalline, but also because of their quite different behaviours to conventional low-molar-mass LCs. LC dimers may be divided into two broad classes: symmetric [10,37,42] and nonsymmetric.…”

Section: Introductionmentioning

confidence: 99%

“…LC dimers may be divided into two broad classes: symmetric [10,37,42] and nonsymmetric. [21,23,24,[29][30][31][32][33][34][35]42,43] In a symmetric LC dimer, the two mesogenic units are identical, whereas they are different in a non-symmetric dimer. The intercalated smectic phase was first observed in the study of LC dimers and, specifically, in non-symmetric dimers.…”

Section: Introductionmentioning

confidence: 99%

1,2-Propanediol-linked chiral symmetric and non-symmetric liquid crystal dimers containing trifluoromethyl

Yao

Feng

et al. 2016

Liquid Crystals

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2016): 1,2-Propanediol-linked chiral symmetric and nonsymmetric liquid crystal dimers containing trifluoromethyl, Liquid Crystals, ABSTRACT Four symmetric and non-symmetric chiral liquid crystal dimers containing trifluoromethyl groups, termed as TFBA-PD-TFBA, UEBBA-PD-TFBA, UEBA-PD-TFBA and UEA-PD-TFBA, respectively, have been synthesised and characterised. UEA-PD-TFBA exhibited chiral nematic phase, whereas the other three dimers displayed chiral smectic A phase. X-ray diffraction (XRD) has revealed the structure of the smectic A phase for TFBA-PD-TFBA to be intercalated, whereas that for UEBBA-PD-TFBA and UEBA-PD-TFBA to be monolayer and interdigitated, respectively. In addition, the weaker peak corresponding to a shorter layer spacing was observed for UEBBA-PD-TFBA and UEBA-PD-TFBA. Considering the results of XRD measurements and computer simulations, the structural model corresponding to the shorter layer spacing is assigned as horseshoe-like shape. The absence of smectic behaviour for UEA-PD-TFBA reveals that the weaker aromatic-aromatic interactions cannot stabilise the smectic A phase. ARTICLE HISTORY

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The role of hydrogen bonding in the phase behaviour of supramolecular liquid crystal dimers

Cited by 98 publications

References 53 publications

Does Topology Dictate the Incidence of the Twist‐Bend Phase? Insights Gained from Novel Unsymmetrical Bimesogens

Does Topology Dictate the Incidence of the Twist‐Bend Phase? Insights Gained from Novel Unsymmetrical Bimesogens

Supramolecular complexes based on liquid‐crystalline polysiloxanes and copper phthalocyanine

1,2-Propanediol-linked chiral symmetric and non-symmetric liquid crystal dimers containing trifluoromethyl

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