Influence of the Alkyl Spacer Length on the Phase Transition Behaviour of the λ-Shaped Liquid Crystal

Molecular Organization of Preorganized S-Shaped Oligomers in the Liquid Crystalline Phases

“…The residue was washed with dichloromethane and purified using HPLC with chloroform as eluant. Recrystallization from ethanol gave the desired product; yield 90 mg (14% The other compounds presented in this paper were obtained by a similar method to that for I- (8,8). Analytical data for other compounds are given below.…”

“…4,4 0 -Bis (8-(2-(8-(4-(cyanophenyl)phenyloxy) octyloxy)phenyloxy)octyloxy)biphenyl, I- (8,8) Potassium carbonate (2.41 g, 17.5 mmol) was added to a solution of 4-cyano-4 0 -hydroxybiphenyl (2.92 g, 15 mmol) and 1, 8-dibromohexane (5.40 g, 20 mmol) in cyclohexanone (45 mmol). The resulting mixture was stirred at 70 C for 10 h. After filtration of the precipitate, the solvent was removed by evaporation.…”

“…We have designed novel preorganized systems, e.g., a flexible dimesogenic compound [5], a U-shaped molecule [6], a binaphthyl derivative [7], a k-shaped molecule [8], V-shaped [9], T-shaped [10] and Y-shaped molecules [11]; the preorganized supermolecules were found to induce unusual ordering in the supramolecular liquid crystalline phase. Recently, we reported pronounced odd-even effects in the transition behavior of U-shaped systems [12].…”

Dielectric relaxation study of a H shaped liquid crystal dimer

“…However, disorder associated with the terminal chains reduces the stability of solid crystal phases and allows the appearance of liquid crystal phases. Some of the liquid crystal phases exhibited by materials with molecules of unusual shapes, such as lambda shape, X shape, S shape, are reported in the literature [3,4,7,8]. One of the interesting sub-fields of the liquid crystals designing are liquid crystal dimer [9] with unusual shape [4][5][6][7].…”

“…These basic shapes are rather easy for designing nematic, smectic or columnar arrangements [1][2][3]. The inventive action of chemists led to the synthesis of new shaped liquid crystalline materials with more anisotropic properties and as a result of which, the new mesomorphic arrangements were invented.…”