Molecular and crystal structure of 4-alkoxybenzoic acids: Design of the mesogenic phase

Кузьмина, Л. Г.; Kucherepa, N. S.; Pestov, S.; Кочетов, А. Н.; Rukk, N. S.; Syrbu, S. A.

doi:10.1134/s1063774509050204

Cited by 28 publications

(11 citation statements)

References 23 publications

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“…As previously reported, pure nAOBA exhibited smectic C phase and nematic phase in the heating process [13]. Molecules tend to point in the same direction in nematic phase and align themselves in layers in smectic phase.…”

Section: Resultssupporting

confidence: 51%

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Enhancing proton conduction via doping of supramolecular liquid crystals (4-alkoxybenzoic acids) with imidazole

Liang

Tan

et al. 2015

Chemical Physics Letters

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Section: Resultssupporting

confidence: 51%

“…4-Alkoxybenzoic acids (nAOBA) have long been known as hydrogen-bonded supramolecular liquid crystals [13][14][15]. The dynamically ordered hydrogen bonds in the mesomorphic nAOBA provide potential pathways for proton conduction.…”

Section: Introductionmentioning

confidence: 99%

Enhancing proton conduction via doping of supramolecular liquid crystals (4-alkoxybenzoic acids) with imidazole

Liang

Tan

et al. 2015

Chemical Physics Letters

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“…[e.g., 22,23] The analysis shows that the sample consists of single phase only. The calculated unit cell volumes of the starting acids are V(I) D 600 A 3 and V(II) D 800 A 3 , which correlates with the published data.…”

Section: X-ray Diffraction Of P-n-heptyloxybenzoic (I)àp-n-undecloxybmentioning

confidence: 99%

Study of phase behavior in a system of linear hydrogen-bonded carboxylic acid homologues

et al. 2015

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The system of hydrogen-bonded liquid crystals formed from binary mixtures p-nheptyloxybenzoic (I) acid and p-n-undecloxybenzoic (II) acid has been investigated by polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction, and scattering and dielectric measurements. The TÀX phase diagram was obtained for this system. All mixtures show enantiotropic smectic and nematic phases. The crystalline phase represents a (a, b) solid solution. At the 2:1 ratio of I to II, an intermediate phase À co-crystal g À is formed. The co-crystal g possesses a much wider mesophase range than the corresponding initial components. In contrast to mixtures based on the solid solutions having a positive anisotropy, the co-crystal shows a negative dielectric anisotropy in the mesophase.

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“…These supramolecular ensembles determine the degree of structuring of the melt and set the LC properties of the system. Previ ously we successfully used this ideology to analyze the compounds of a homologous series of 4 alkyloxyben zoic acid [4] and p (n alkyloxybenzylidene) n' tolui dine [5][6][7], having established a relationship between the form of the mesophase produced by these com pounds and the specific features of their crystal pack ing. On this basis it was proposed to describe the phase transitions with the participation of the mesophase using the representation of the crystal and mesophase structures in the form of graphs.…”

Section: Introductionmentioning

confidence: 99%

Mesophase design: II. Molecular structure and crystal packing of 4-alkyloxycyanobiphenyls

2012

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A joint analysis of the molecular geometry and crystal packings of the members of a homologous series of 4 alkyloxycyanobiphenyl C n H 2n + 1 -O-C 6 H 4 -C 6 H 4 -CN with n = 5-12 does not reveal a direct relationship between the molecular geometry and mesogenic properties of these compounds. The crystal packings of all of them are built from alternating loose aliphatic and dense aromatic regions. The closely packed aromatic regions of crystals exhibit weak intermolecular directed interactions of different natures which are responsible for the occurrence of the mesophase. The type of mesophase depends on the number s of structure forming elements, the ratio of their energies (if s > 1), and the melting temperature of the com pound. A graph system is used to describe the crystal packings and the mesophase. It is shown that, although the mesophase graph is similar to the crystal graph, they may differ somewhat, because some symmetric lim itations (for example, lattice) on the molecular associate structure are removed in the melt.

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Molecular and crystal structure of 4-alkoxybenzoic acids: Design of the mesogenic phase

Cited by 28 publications

References 23 publications

Enhancing proton conduction via doping of supramolecular liquid crystals (4-alkoxybenzoic acids) with imidazole

Enhancing proton conduction via doping of supramolecular liquid crystals (4-alkoxybenzoic acids) with imidazole

Study of phase behavior in a system of linear hydrogen-bonded carboxylic acid homologues

Mesophase design: II. Molecular structure and crystal packing of 4-alkyloxycyanobiphenyls

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