Cis, cis-(3,5-dihydroxycyclohexyl) 3,4-bis(alkoxy)benzoates Thermal behaviour and water absorption

Columnar liquid crystalline phases through hydrogen bonding and nanoscale segregation

“…16,17 In contrast to the 4-alkoxybenzoic acids 2, the 3,4bis(alkoxy)benzoic acids 3 are only crystalline compounds. 18 The phase transition temperatures of the pure compounds 1-3 are summarized in Table 1.…”

The effect of the shape of the mesogenic group on the structure and phase behavior of 2,3,4-tris(dodecyloxy)benzenesulfonates with alkaline cations

“…exhibiting thermotropic and lyotropic smectic, columnar and cubic phases. [2][3][4][5][6][7] Such compounds are important examples of self-assembling systems which are extremely sensitive to the state of the environment, because even a slight modication of the shape of a molecule, caused by a change in the functional of its free energy, 8 may signicantly alter the shapes of its supramolecular aggregates, which is the reason why the structure of the material can be controlled precisely. For instance, self-assembling under an electric eld makes it possible to orient nano-conducting channels on the substrate surface.…”

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“…22 In contrast, in reversed type lyotropic mesophases (where the lipophilic chains form the continuum) only the Fd3m lattice has been found for the micellar cubic phases (Cub I2 ), whereas for the bicontinuous phases (Cub V2 ) Pn3m and Im3m lattices were reported in addition to the Ia3d lattice. 9 In recent years amphiphilic polyhydroxy compounds [23][24][25][26][27][28] and carbohydrate derivatives [27][28][29][30][31][32][33] have received special attention, because these low molecular weight amphiphiles can form liquid crystalline phases in the presence of protic solvents (lyotropic phases), as well as in their absence (thermotropic phases). Hence, they represent an important class of amphotropic liquid crystals.…”

“…Hence, they represent an important class of amphotropic liquid crystals. [23][24][25][26][27][28][29][30][31][32][33][34][35] As shown in Fig. 2, the mesophase morphologies of the thermotropic mesophases can easily be tailored by variation of the number and position of the hydrogen bonding groups (OH groups) as well as by variation of the number, the length and the chemical structure of the lipophilic chains, leading to the phase sequence Cub I2 -Col h2 -Cub V2 -SmA-Cub V1 -Col h1 with increasing volume fraction of the polar groups.…”