Synthesis and Properties of Liquid Crystals with Fluorinated Terminal Substituents

Synthesis and Stereochemical Aspects of 2,6‐Disubstituted Perhydroazulenes – Core Units for a New Class of Liquid Crystalline Materials

“…The disadvantage of these types of devices is the narrow and non-uniform view cone which affects their performance. The use of the multidomain technique, [3] the introduction of an optical compensator to reduce the amount of light leakage in the dark state, [4] the use of an electrical field parallel to the plane of the substrates, [5] the use of amorphous twisted nematic liquid crystals, [6] and various modifications in the calamitic liquid crystals with a phenyl-(bicyclohexyl) moiety, [7][8][9][10][11] have enhanced and optimized their performance.…”

Sulfur as a Structural Element in Calamitic Liquid Crystals. 2 Terminal, Linking, Axial and Lateral Substitutions. 3 Sulfur-Containing Rings

“…It can be seen from Table 15 that the ketonization of the fused system based on 1,3-oxathiolane results in the formation of benzo [1,3] oxathiol-2-one, which can be used as the structural fragment in liquid crystals. One can say that the introduction of benzo [1,3]oxathiol-2-one into the molecular core of liquid crystals, depending on their structures, leads to the disappearance of the mesophases or formation of the mesophases with the lowest clearing temperature in comparison with those of the corresponding reference ketones (compounds 15-1 to 15-3; 15-4 to 15-6).…”

“…Benzo [1,3]oxathiol-2-one. It can be seen from Table 15 that the ketonization of the fused system based on 1,3-oxathiolane results in the formation of benzo [1,3] oxathiol-2-one, which can be used as the structural fragment in liquid crystals.…”

“…In continuation of our study of the structure-property relationships in sulfurcontaining liquid crystals (see, for example, the previous publications [1][2][3][4][5][6]) we present here a review that examines in some detail the effect of the introduction of the sulfur atom into the molecular structure of calamitic liquid crystals on the appearance of the mesophases and their physico-chemical properties. When possible, the properties of the sulfur derivatives will be compared with those of the corresponding hydrocarbon and oxygen derivatives.…”

Effects of reducing structural symmetry on mesophase behaviour: the synthesis and characterization of the 2-alkoxy-6-[4-(4-alkoxyphenyl)buta-1,3-diynyl]naphthalenes

“…However, many other structural factors can also be manipulated in order to adjust the melting and clearing temperatures as well as the mesophase temperature ranges. Examples include, the introduction of terminal [2] or lateral [3] fluorinecontaining units, the introduction of double bonds into the terminal chains [4], and the introduction of a cyano group [5]; each of these approaches has been shown to exert a great impact on transition temperatures as well as on mesogenic properties. Symmetry lowering has also played an important role in controlling the transition temperatures and temperature ranges of liquid crystals [6,7].…”