Semiconducting and electropolymerizable liquid crystalline carbazole-containing porphyrin-core dendrimers

2020 ◽  
Vol 7 (15) ◽  
pp. 2008-2015 ◽  
Author(s):  
Alberto Concellón ◽  
Roberto Termine ◽  
Attilio Golemme ◽  
Pilar Romero ◽  
Mercedes Marcos ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Liquid Crystalline ◽  
Porphyrin Core ◽  
Crystal Phases ◽  
Liquid Crystal Phases

We have successfully synthesized porphyrin-core dendrimers with peripheral carbazole moieties, which can be electrochemically crosslinked. Moreover, these dendrimers exhibit discotic nematic liquid crystal phases with high hole mobilities.

Experimental Observation of a Transition between Two Uniaxial Nematic Liquid-Crystal Phases

1994 ◽  
Vol 73 (4) ◽  
pp. 565-568 ◽  
Author(s):  
G. Nounesis ◽  
Satyendra Kumar ◽  
S. Pfeiffer ◽  
R. Shashidhar ◽  
C. W. Garland
Keyword(s):  
Liquid Crystal ◽  
Experimental Observation ◽  
Nematic Liquid Crystal ◽  
Crystal Phases ◽  
Liquid Crystal Phases

scholarly journals Cubic and tetragonal liquid crystal phases composed of non-chiral molecules: Chirality and macroscopic properties

2019 ◽  
Vol 42 (11) ◽  
Author(s):  
Helmut R. Brand ◽  
Harald Pleiner
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Triblock Copolymers ◽  
Similar Type ◽  
Chiral Molecules ◽  
Chiral Compounds ◽  
Liquid Crystalline Phases ◽  
Symmetry Properties ◽  
Crystal Phases ◽  
Liquid Crystal Phases

Abstract. We discuss the symmetry properties as well as the macroscopic behavior of the cubic liquid crystal phases showing large chiral domains of either hand in some non-chiral compounds reported recently in the group of Tschierske. These phases are tricontinuous. While they have O or I432 symmetry in each chiral domain, the overall symmetry is $ I m \bar{3} m$Im3¯m as there is no net chirality for compounds composed of non-chiral molecules. It turns out that a rather similar type of phase has also been reported for triblock copolymers. Here we analyze in detail the macroscopic static and dynamic behavior of such phases and we predict, among other results, that they show the analog of static and dissipative Lehmann-type effects in their chiral domains. A description of a cubic liquid crystalline phase of Th symmetry, which has not yet been found experimentally, is also included. Suggestions for experiments are outlined to identify such a phase. In addition, we discuss tetragonal liquid crystalline phases of D4h and D4 (I422) symmetry as they have been reported last year experimentally in connection to the Q phase. Graphical abstract

The Formation of Nematic Liquid Crystal Phases by Hen Lysozyme Amyloid Fibrils

2006 ◽  
Vol 128 (46) ◽  
pp. 14740-14741 ◽  
Author(s):  
Adam M. Corrigan ◽  
Christian Müller ◽  
Mark R. H. Krebs
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Amyloid Fibrils ◽  
Crystal Phases ◽  
Liquid Crystal Phases

scholarly journals Luminescence modulation in liquid crystalline phases containing a dispiro[fluorene-9,11′-indeno[1,2-b]fluorene-12′,9′′-fluorene] core

2014 ◽  
Vol 2 (21) ◽  
pp. 4265-4275 ◽  
Author(s):  
Sébastien Thiery ◽  
Benoît Heinrich ◽  
Bertrand Donnio ◽  
Cyril Poriel ◽  
Franck Camerel
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Crystalline Phases ◽  
Thermotropic Liquid Crystal ◽  
Liquid Crystalline Phases ◽  
Crystal Phases ◽  
Liquid Crystal Phases

Luminescence modulations of a bulky dispiro[fluorene-9,11′-indeno[1,2-b]fluorene-12′,9′′-fluorene] (DSF-IF) core embedded in thermotropic liquid crystal phases.

Odd–Even Effect of Dopant Molecules on Clearing Temperatures of Nematic Liquid-crystal Phases

2012 ◽  
Vol 41 (11) ◽  
pp. 1465-1467 ◽  
Author(s):  
Keiki Kishikawa ◽  
Yuri Haga ◽  
Takahiro Inoue ◽  
Tomohiro Watanabe ◽  
Masahiro Takahashi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Crystal Phases ◽  
Liquid Crystal Phases

scholarly journals Chiral Liquid Crystalline Electronic Systems

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 672
Author(s):  
Masahiro Funahashi
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Field Effect Transistors ◽  
Photovoltaic Effect ◽  
Electronic Charge ◽  
Circularly Polarized ◽  
Smectic C ◽  
Chiral Nematic ◽  
Crystal Phases ◽  
Liquid Crystal Phases

Liquid crystals bearing extended π-conjugated units function as organic semiconductors and liquid crystalline semiconductors have been studied for their applications in light-emitting diodes, field-effect transistors, and solar cells. However, studies on electronic functionalities in chiral liquid crystal phases have been limited so far. Electronic charge carrier transport has been confirmed in chiral nematic and chiral smectic C phases. In the chiral nematic phase, consisting of molecules bearing extended π-conjugated units, circularly polarized photoluminescence has been observed within the wavelength range of reflection band. Recently, circularly polarized electroluminescence has been confirmed from devices based on active layers of chiral conjugated polymers with twisted structures induced by the molecular chirality. The chiral smectic C phase of oligothiophene derivatives is ferroelectric and indicates a bulk photovoltaic effect, which is driven by spontaneous polarization. This bulk photovoltaic effect has also been observed in achiral polar liquid crystal phases in which extended π-conjugated units are properly assembled. In this manuscript, optical and electronic functions of these chiral π-conjugated liquid crystalline semiconductors are reviewed.

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