Über die einfachsten kristallin flüssigen Substanzen. Ein Beitrag zur chemischen Morphologie der Flüssigkeiten

Columnar liquid crystalline phases through hydrogen bonding and nanoscale segregation

“…4-Alkoxybenzoic acids such as compounds 2 are one of the first class of compounds known to exhibit thermomesomorphism due to hydrogen bonding. [13][14][15] The thermotropic phases are composed of hydrogen bonded anisometric dimers. The carboxylic acids 2a-c display a smectic C mesophase and a nematic phase at elevated temperatures.…”

New phase sequences in banana-shaped mesogens: influence of fluorine substituent in compounds derived from 2,7-dihydroxynaphthalene

“…24 4-n-Alkoxybenzoic acids were prepared following a procedure described in the literature. 26 The 2-fluoro-4-n-alkoxybenzoic acids and 3-fluoro-4-n-alkoxybenzoic acids were prepared using a procedure described earlier. 22 The bisphenols b (R 1 , R 2 ~H or F) were obtained by the esterification reaction of 2,7-dihydroxynaphthalene with 4-benzyloxybenzoic acid, 2-fluoro-4-benzyloxybenzoic acid or 3-fluoro-4-benzyloxybenzoic acid in the presence of N,N'-dicyclohexylcarbodiimide as dehydrating agent and 4-(N,N-dimethylamino)pyridine as a catalyst followed by hydrogenolysis using 5% Pd-C in 1,4-dioxane at about 50 uC.…”

Theoretical Study of Hydrogen-Bonded Supramolecular Liquid Crystals

“…For example, a free A-molecule is given by (1, 0), a free B-molecule is (0, 1), a heterodimer is (1, Here, the number density, i.e., the number of (l,m)-clusters per lattice cell, is defined by ν l,m ≡ N l,m / Ω, and the volume fraction is defined by φ l,m ≡ (n A l + n B m)ν l,m , where Ω is the total number of the cells on the hypothetical lattice. If we assume that all statistical units on the A-molecule and the B-molecule have the same volume a 3 , and regard also the volume of the lattice cell as a 3 , Ω is defined by…”

“…For example, aromatic acid derivatives with alkoxy or alkyl terminal groups form dimers due to a hydrogen bond between their carboxylic acid groups and show mesomorphism. [1][2][3][4] Association between different species of molecules also induces the isotropic/anisotropic phase transition. 5,6 Mesophases of some liquid-crystalline molecules are stabilized by a hydrogen bond with different species of molecules.…”

“…Some rigid molecules are known to undergo liquid crystallization when hydrogen-bonded to each other. For example, aromatic acid derivatives with alkoxy or alkyl terminal groups form dimers due to a hydrogen bond between their carboxylic acid groups and show mesomorphism. − Association between different species of molecules also induces the isotropic/anisotropic phase transition. , Mesophases of some liquid-crystalline molecules are stabilized by a hydrogen bond with different species of molecules. More markedly, some nonmesogenic molecules form a compound with a mesogenic core when hydrogen bonded.…”