Journal ArticleDOI
The Synthesis of Several Lateral Difluoro-substituted 4,4″-Dialkyl- and 4,4″-Alkoxyalkyl-Terphenyls and a Rationalisation of the Effect of Such Substitution on Mesophase Type and Transition Temperatures
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TLDR
In this article, the synthesis and transition temperatures of a variety of related difluoro compounds are presented so that it is now possible to identify broadening of the molecule, twisting about an interannular bond, and the presence of an inner (2-, 2'-, 3'- or 2'' substituent) or an outer (3- or 3''-substituent) fluorine, as being the major factors which influence the type and the thermal stability of the mesophases obtained.Abstract:
In recent years we have prepared a large number of mono-fluoro- and ortho-difluoro-substituted 4,4''-dialkyl- and 4,4''-alkoxyalkyl-terphenyls. The synthesis and transition temperatures of a variety of related difluoro compounds is presented here so that it is now possible to identify(i) broadening of the molecule, (ii) twisting about an inter-annular bond, and (iii) the presence of an inner (2-, 2'-, 3'- or 2'' substituent) or an outer (3- or 3''-substituent) fluorine, as being the major factors which influence the type and the thermal stability of the mesophases obtainedread more
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Fluorinated liquid crystals – properties and applications
TL;DR: This critical review begins with a brief, but essential, introduction to the special nature of liquid crystal materials, their peculiar properties, and their commercial applications, followed by an introductory insight into the remarkable nature of the fluoro substituent, and its fascinating influence on the properties of organic compounds.
Journal ArticleDOI
The synthesis and high optical birefringence of nematogens incorporating 2,6-disubstituted naphthalenes and terminal cyano-substituent
TL;DR: A range of nematogenic materials which incorporate a 2,6-disubstituted naphthyl moiety and a terminal cyano-substituent have been synthesized by using palladium-catalysed cross-coupling procedures involving arylboronic acids and alkynylzinc reagents with aryls iodides, bromides and trifluoromethanesulphonates (triflates).
Journal ArticleDOI
Liquid crystals with restricted molecular topologies: supermolecules and supramolecular assemblies
John W. Goodby,Georg H. Mehl,Isabel M. Saez,Rachel P. Tuffin,Graham Mackenzie,Rachel Auzély-Velty,Thierry Benvegnu,Daniel Plusquellec +7 more
TL;DR: In this article, the authors describe some recent studies concerning the liquid-crystalline behavior of in-between materials that have discrete molecular structures, and which are oligomeric but not low molar mass or polymeric systems.
Journal ArticleDOI
Fluorinated liquid crystals formed by halogen bonding
Pierangelo Metrangolo,Carsten Präsang,Giuseppe Resnati,Rosalba Liantonio,Adrian C. Whitwood,Duncan W. Bruce +5 more
TL;DR: New, halogen-bonded fluorinated mesogens are reported; the expected microphase separation associated with perfluoroalkyl chains is surprisingly absent in the mesophase.
Journal ArticleDOI
Structure-function relationships in liquid-crystalline halogen-bonded complexes.
Duncan W. Bruce,Pierangelo Metrangolo,Franck Meyer,Tullio Pilati,Carsten Präsang,Giuseppe Resnati,Giancarlo Terraneo,Stephen G. Wainwright,Adrian C. Whitwood +8 more
TL;DR: New liquid-crystalline materials were prepared by self-assembly driven by halogen bonding between a range of 4-alkoxystilbazoles, 4-ALKyl-, and 4-alksoxy-substituted pyridines as halogen-bonding acceptors, and substituted derivatives of4-iodotetrafluorophenyl as Halogen- bonding donors, leading to new chiral mesogens starting from non-mesomorphic chiral compounds.
References
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Journal ArticleDOI
The Palladium-Catalyzed Cross-Coupling Reaction of Phenylboronic Acid with Haloarenes in the Presence of Bases
TL;DR: The transition metal-catalyzed reactions of organometallics with organic halides have been extensively studied to prove a new approach to selective formation of carbon-carbon bonds as mentioned in this paper.
BookDOI
Liquid crystals and ordered fluids
TL;DR: In this paper, the authors present a NMR study of the transition of a mixture of two Isomeric Cyano-Ester homologous series, showing that the phase transition of one of the two isomeric versions of this series is a transition of the other.
Book
Thermotropic liquid crystals
TL;DR: In this article, the authors classify liquid crystal phases in relation to molecular structure materials requirements for Nematic and Chiral Nematic Electro-optical Displays Materials Requirements for Smectic Liquid Crystal Displays Cholesteric Materials for Surface Thermography Liquid Crystal Polymers.
Journal ArticleDOI
New family of nematic liquid crystals for displays
TL;DR: New organic compounds of positive dielectric anisotropy giving nematic liquid crystals at room temperature, either as the pure compounds or in admixture, are described in this article, where they are of improved stability, and function well in electro-optical devices based on the twisted-nematic or cholesteric nematic phase-change effects.