Insertion of a difluorooxymethylene bridge into the mesogenic core structure of phenylcyclohexane‐based liquid crystals results in a class of materials that exhibits a surprising and unprecedented improvement of essentially all application‐relevant properties (see scheme). A novel synthetic procedure allows the convenient large‐scale preparation of a variety of compounds based on α,α‐difluoroalkyl ether structures.
The article contains sections titled:
Introduction to the Chiral Nematic Phase and Its Properties
Formulation and Application of Chiral Nematic Liquid Crystal Mixtures
Applications of Chiral Nematic Phases
Classification of Chiral Nematic Liquid‐Crystalline Compounds
Aspects of Molecular Symmetry for Chiral Nematic Phases
Type
I
Chiral Nematic Liquid Crystals
Azobenzenes and Related Mesogens
Azomethine (
S
chiff's Base) Mesogens
Stable Phenyl, Biphenyl, Terphenyl, and Phenylethylbiphenyl Mesogens
Ester Mesogens
Derivatives of Chiral Alcohols
Type
II
Chiral Nematic Liquid Crystals
Type
IIa
Twin Systems Using Chiral Flexible Spacers
Type
IIb
Materials Using Achiral Flexible Spacers and Chiral Terminal Groups
Type
IIc
and
d
Materials Using One or Two Chiral Cores
Type
III
Chiral Nematic Liquid Crystals
Cholesteryl Esters
Chiral Mesogens Derived from Cyclohexane
Chiral Heterocyclic Mesogens
Axially Chiral Liquid Crystals
Axially Chiral Alkenes and Overcrowded Alkenes
Allenes
Tricyclo[4.4.0.0
3,8
]decane or Twistane Derived Mesogens
Sterically Hindered Biphenyl Derivatives
Spirobiindane Derivatives
Concluding Remarks
Dedicated to Professor Heinz A. Staab on the occasion of his 75th birthday In our search for new, superior liquid crystals [1] for use in active-matrix liquid crystal displays [2] (AM-LCD or thin film transistor LCD, TFT-LCD) it was found that the insertion of a difluorooxymethylene bridge into a specific location of the mesogenic core structure of phenylbicyclohexyl-type liquid crystals (1) [3] results in a class of materials (2; Scheme 1) [4] that Scheme 1. The liquid crystalline basic structure 1 and its analogue 2 which is extended by a difluorooxymethylene bridge.
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