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Liquid Crystals

Liquid crytals (LCs) are probably the most exciting state of matter. They attract scientists across disciplines such as chemistry, physics, materials science, and engineering—theorists and experimentalists alike. These days, you can buy quite affordable LCD TV sets around the corner, but that's just one of the many things liquid crystals can do. The selection of recent research articles presented below illustrates the broad interest in this area of soft condensed matter.

Recommended Reading

J. W. Goodby, P. J. Collings, T. Kato, C. Tschierske, H. Gleeson, P. Raynes (Eds)
Handbook of Liquid Crystals
2nd edition, Wiley-VCH, Weinheim, 2014.

Find all articles on liquid crystals in Wiley Online Library...

See the International Liquid Crystal Society's website.

Recent Articles

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Tomokatsu Kushida, Ayumi Shuto, Masafumi Yoshio, Takashi Kato, Shigehiro Yamaguchi
A Planarized Triphenylborane Mesogen: Discotic Liquid Crystals with Ambipolar Charge-Carrier Transport Properties [Communication]

A Planarized Triphenylborane Mesogen: Discotic Liquid Crystals with Ambipolar Charge-Carrier Transport Properties

B planar, B aligned: A planarized triphenylborane, bearing three 3,4,5-tridodecyloxyphenyl groups, forms a hexagonal columnar liquid-crystalline phase at ambient temperature. It has a columnar π-stacked structure and ambipolar carrier-transport properties with hole- and electron-mobility values of 3×10−5 cm2 V−1 s−1 and approximately 10−3 cm2 V−1 s−1, respectively.

Angew. Chem. Int. Ed., April 23, 2015, DOI: 10.1002/anie.201502678

Tiago E. Frizon, Jamal Rafique, Sumbal Saba, Ivan H. Bechtold, Hugo Gallardo, Antonio L. Braga
Synthesis of Functionalized Organoselenium Materials: Selenides and Diselenides Containing Cholesterol [Full Paper]

Synthesis of Functionalized Organoselenium Materials: Selenides and Diselenides Containing Cholesterol

A new series of selenide and diselenide liquid crystals containing cholesterol were synthesized and characterized. Most of the materials presented good thermal stability with SmC* and SmA* phases over a wide temperature range. The prepared diselenides also have potential biological applications, and they showed good antioxidant properties.

Eur. J. Org. Chem., April 21, 2015, DOI: 10.1002/ejoc.201500124

Richard J. Mandle, Edward J. Davis, Craig T. Archbold, Constantin C. A. Voll, Jessica L. Andrews, Stephen J. Cowling, John W. Goodby
Apolar Bimesogens and the Incidence of the Twist–Bend Nematic Phase [Full Paper]

Apolar Bimesogens and the Incidence of the Twist–Bend Nematic Phase

The curious incident of the mesogen in the twist–bend nematic phase: A large number of new materials that exhibit the “twist–bend nematic phase” have been prepared, allowing several trends between structure and liquid-crystalline behaviour to be found.

Chem. Eur. J., April 20, 2015, DOI: 10.1002/chem.201500423

Matthias Georg Schwab, Masayoshi Takase, Alexey Mavrinsky, Wojciech Pisula, Xinliang Feng, José A. Gámez, Walter Thiel, Kunal S. Mali, Steven de Feyter, Klaus Müllen
Torands Revisited: Metal Sequestration and Self-Assembly of Cyclo-2,9-tris-1,10-phenanthroline Hexaaza Macrocycles [Full Paper]

Torands Revisited: Metal Sequestration and Self-Assembly of Cyclo-2,9-tris-1,10-phenanthroline Hexaaza Macrocycles

Three in one: A series of toroidal cyclo-2,9-tris-1,10-phenanthroline macrocycles with a unique hexaaza cavity are reported (see figure). Yamamoto aryl–aryl coupling is a versatile tool for the cyclotrimerization of functionalized 1,10-phenathroline precursors. For the first time, the liquid crystallinity and self-assembly on surfaces could be studied for a macrocycle of the torand family.

Chem. Eur. J., April 13, 2015, DOI: 10.1002/chem.201406602

Mirosław Salamończyk, Damian Pociecha, Agnieszka Nowak-Król, Dominik Koszelewski, Daniel T. Gryko, Ewa Górecka
Liquid-Crystalline Properties of trans-A2B2-Porphyrins with Extended π-Electron Systems [Communication]

Liquid-Crystalline Properties of trans-A2B2-Porphyrins with Extended π-Electron Systems

Smectic porphyrins: The replacement of two meso-aryl groups of porphyrins with phenylethynyl or naphthylethynyl substituents increases the melting points of the resultant porphyrins by ∼100 °C and has allowed thermotropic liquid crystallinity to be demonstrated, including a unique switch from columnar to smectic phase.

Chem. Eur. J., March 30, 2015, DOI: 10.1002/chem.201500295

Edivandro Girotto, Marli Ferreira, Parantap Sarkar, Ahmed Bentaleb, Elizabeth A. Hillard, Hugo Gallardo, Fabien Durola, Harald Bock
Plank-Shaped Column-Forming Mesogens with Substituents on One Side Only [Full Paper]

Plank-Shaped Column-Forming Mesogens with Substituents on One Side Only

On the same side: Dinaphthopyrene-diimides derived from 1,8-disubstituted pyrene, with both substituents on the same side, stack into columns to form hexagonal and rectangular liquid crystals and thus fully function as semi-flexible self-assembling disks (see figure). In contrast, their centrosymmetric isomers derived from 1,6-disubstituted pyrene are less prone to form liquid crystals.

Chem. Eur. J., March 27, 2015, DOI: 10.1002/chem.201500048

Subham Bhattacharjee, Suman K. Samanta, Parikshit Moitra, K. Pramoda, Ram Kumar, Santanu Bhattacharya, C. N. R. Rao
Nanocomposite Made of an Oligo(p-phenylenevinylene)-Based Trihybrid Thixotropic Metallo(organo)gel Comprising Nanoscale Metal–Organic Particles, Carbon Nanohorns, and Silver Nanoparticles [Full Paper]

Nanocomposite Made of an Oligo(p-phenylenevinylene)-Based Trihybrid Thixotropic Metallo(organo)gel Comprising Nanoscale Metal–Organic Particles, Carbon Nanohorns, and Silver Nanoparticles

Horn section: Silver ion-triggered metallogelation of a solution of p-pyridyl-appended oligo(p-phenylenevinylene) (OPV)-based scaffolds comprising uniformly dispersed single-walled carbon nanohorns (SWCNHs) is reported. Aging of the metallogel results in the formation of a trihybrid gel comprising nanoscale metal–organic particles (NMOPs), SWCNHs, and in situ generated silver nanoparticles (AgNPs) (see figure).

Chem. Eur. J. 2015, 21, No. 14, 5467-5476

A Perfect Match: Fullerene Guests in Star-Shaped Oligophenylenevinylene Mesogens

Come into my arms: Stilbenoid star-shaped mesogens pack densely, in helical structures that have a short correlation length, in columnar liquid-crystal phases. Attaching a fullerene guest to the interior of the star fills the void space between the arms and considerably increases the mesophase stability by approximately 70 °C. The stabilization is the result of the formation of a fullerene triple helix.

Angew. Chem. Int. Ed. 2015, 54, No. 13, 4110-4114

Kai Liu, Min Shuai, Dong Chen, Michael Tuchband, Jennifer Y. Gerasimov, Juanjuan Su, Qing Liu, Wojciech Zajaczkowski, Wojciech Pisula, Klaus Müllen, Noel A. Clark, Andreas Herrmann
Solvent-free Liquid Crystals and Liquids from DNA [Communication]

Solvent-free Liquid Crystals and Liquids from DNA

Liquefying DNA: A series of solvent-free DNA melts that exhibit both liquid-crystal ordering and melting into isotropic liquids have been generated by electrostatic complexation of DNA with surfactants. Stable smectic mesophases and liquid phases are obtained in the −20 °C to 200 °C temperature range without thermal degradation of the DNA.

Chem. Eur. J. 2015, 21, No. 13, 4898-4903

Marli Ferreira, Edivandro Girotto, Ahmed Bentaleb, Elizabeth A. Hillard, Hugo Gallardo, Fabien Durola, Harald Bock
Columnar Liquid-Crystalline Dinaphthoperylenetetracarboxdiimides [Full Paper]

Columnar Liquid-Crystalline Dinaphthoperylenetetracarboxdiimides

Mesogenic core-extended perylenes: Tetracarboxy-substituted dinaphthoperylenes are obtained from perylene through regiospecific Friedel–Crafts diglyoxylation. Whereas the n-alkyl esters only show monotropic mesomorphism and racemically branched alkyl esters fail to show any mesophase, swallow-tailed alkylimides exhibit astonishingly robust liquid crystalline self-assembly (see figure).

Chem. Eur. J. 2015, 21, No. 11, 4391-4397

Michael Giese, Lina K. Blusch, Mostofa K. Khan, Mark J. MacLachlan
Functional Materials from Cellulose-Derived Liquid-Crystal Templates [Review]

Functional Materials from Cellulose-Derived Liquid-Crystal Templates

Out of the woods: Novel mesoporous and nanostructured materials can be generated by templating approaches based on cellulose-based liquid crystals derived from trees. This Review focuses on materials templated by cellulose nanocrystals, since their chiral nematic order allows their use in various optical applications such as optical filters, sensors, and optoelectronics.

Angew. Chem. Int. Ed. 2015, 54, No. 10, 2888-2910

Di- and Tricationic Organic Salts: An Overview of Their Properties and Applications

Di- and tricationic organic salts combine the properties of corresponding monocationic salts with individual features due to the presence of different charged heads on the cation structures. This allows their use in different fields of application such as ionic liquid crystals and gel phases.

Eur. J. Org. Chem. 2014, No. 20, 4201-4223

Supramolecular Assemblies by Charge-Transfer Interactions between Donor and Acceptor Chromophores

Riot of color: Alternate stacking of aromatic donor and acceptor building blocks by complementary and directional charge-transfer interactions produce versatile supramolecularly assembled materials including micelles, vesicles, nanotubes, fibrillar gels, folded polymers, cross-linked networks, and liquid-crystalline phases.

Angew. Chem. Int. Ed. 2014, 53, No. 08, 2038-2054

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