The trans-1,4-cyclohexylene group as a structural fragment in liquid crystals

Halogenation in achiral liquid crystals: terminal and linking substitutions

“…Pointing that oxygen in the opposite direction (compound 17-1) results transition temperatures in comparison with those of the hydrogenated LCs. However, some of the results prein the disappearanc e of the nematic phase, and decreasing or increasing, respectively, the clearing point in comsented here and in [21,34,39,51,59,60,276] do not support this suggestion. parison with those of the parent compound and compound 17-2.…”

“…For non-associating exhibit lower values than those of the corresponding systems g is equal to 1. The data presented in [276,313 ] cyano derivatives and compounds without linking groups reveal that the replacement of a cyano group by a chloro or having hydrogenated linking groups (compounds group in two-ring trans-1,4-cyclohexylene derivatives 6-1-6-5, 6-7-6-9, 6-14 and 6-16; 8-2, 8-3, 8-8, 8-13 and (compounds 6-16, 7-1, table 6, 7) results in increasing 8-17; 10-3 and 10-9; 11-1, 11-4-11-6, 11-9-11-13, 12-3, the factor g from 0.590 to 1.20 which corresponds to 12-12 and 12-17; 13-1, 13-2, 13-4-13-7, 13-10 and 13-17; the change of character from antiparallel to parallel 17-1 and 17-4-17-7, 11-5; 17-8 and 17-11, 11-1; 17-13 association.…”

“…These results can be explained in terms of 4. Optical properties the diOE erent tendency for association [321 ] expressed The phenomenological relation between refractive by the correlation coe cient g of these compounds index and electric polarization is de ned as [314,315]: (see § 3 ); and the predominant role of the dimers and, possibly, the monomers in de ning the LC properties (n*2 Õ 1)/(n*2 1 2) 5 Na*/3e o (4 ) for the cyano derivatives and compounds having short halogen-substitute d terminal substituents, respectively where the mean polarizability a* 5 (a d 1 2a ) )/3; the mean refractive index n*2 5 (n2 e 1 2n2 o )/3; n o is the ordinary (considering data on the correlation factor g in § 3 and on the XRD data [161,276,300,322]). and n e is the extraordinary refractive indices.…”

Synthesis and conformation analysis of 4-trans-alkylcyclohexyl 4-trans-alkylcyclohexylmethyl ethers

“…According to the calculations, in compound 1 as well as in compound all isomers with axial bonds possess HOF values about 4-10 kJ mole À1 higher than those obtained for the isomers with equatorial bonds. This is in agreement with the general experience, that the equatorial bound derivatives are more stable than the axial bound isomers [12][13][14]. Study of analysis of 4-Trans-alkylcyclohexyl 4-trans-alkylcyclohexylmethyl ethers 651…”

Liquid-Crystalline Oxygen-Containing Heterocyclic Derivatives. 2 Six-Membered Rings Containing Oxygen as Structural Fragments in Liquid Crystals

“…One of the most useful fragments for the molecular design of liquid crystals is trans-1,4-cyclohexylene [6]. Cyclohexane is known to exist in a chair conformation with the CÀCÀCÀC torsional angle 55 [7].…”