Orientational effects of h-bonding in the chirality transfer from (2R,3R)‑(−)‑2,3-butandiol to polar nematic liquid crystal

Aleksandriiskii, V. V.; Новиков, И. В.; Monakhov, L. O.; Burmistrov, V. A.; Койфман, О. И.

doi:10.1016/j.molliq.2018.10.159

Cited by 12 publications

(14 citation statements)

References 20 publications

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“…3), можно рассчитать наклон соответствующей зависимости dT/dn2 = -0,139 мол. доли -1 , который свидетельствует о достаточно небольшом разрушающем воздействии хиральной кислоты S(+)-МБОБК на мезофазу Н-102 по сравнению с другими оптически активными соединениями [9,10]. Это, повидимому, связано с эффективным встраиванием немезогена в матрицу нематического дизамещенного азобензола.…”

Section: результаты и их обсуждениеunclassified

“…Осуществление эффективного хирального переноса допант -ЖК требует обеспечения оптимальных ориентационных корреляций компонентов за счет сильных межмолекулярных взаимодействий. В качестве таких взаимодействий могут выступать локальные диполь-дипольные контакты [9] и водородные связи [10].…”

Section: Introductionunclassified

“…В работах [10,11] было показано влияние водородных связей на физические свойства индуцированных хиральных нематиков на базе смеси алкилоксицианобифенилов, характеризующихся сильной ассоциацией полярных молекул. При этом была обнаружена термостабилизация мезофазы за счет образования межмолекулярных Н-комплексов цианобифенилпроизводная бензойной кислоты [11].…”

Section: Introductionunclassified

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Influence of 4-(2-S(+)-Methylbutyloxy)Benzoic Acid on Mesomorphic and Physico-Chemical Properties of 4-Butyl-4'-Octanoyloxyazobenzene

Новиков¹,

Aleksandriiskii²,

Burmistrov³

et al. 2020

Liq. Cryst. and their Appl.

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Mesomorphic, optical, dielectric, and orientation properties of nematic liquid crystal 4-butyl-4'-octanoyloxyazobenzene doped with chiral 4-(2-S(+)-methylbutyloxy)benzoic acid have been studied. The clearing temperatures of the mixtures were measured by polarizing microscopy. An estimation of the mesophase destabilization with the introduction of the dopant was carried out. The helix pitch of the induced chiral nematic mesophase was measured. The effect of the chiral dopant on anisotropic characteristics of the mesophase has been studied. An insignificant increase in the optical and dielectric anisotropy is associated with the formation of liquid crystal – dopant supermolecules due to hydrogen bonds –COOH…OCO–.

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Section: результаты и их обсуждениеunclassified

Section: Introductionunclassified

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Influence of 4-(2-S(+)-Methylbutyloxy)Benzoic Acid on Mesomorphic and Physico-Chemical Properties of 4-Butyl-4'-Octanoyloxyazobenzene

Новиков¹,

Aleksandriiskii²,

Burmistrov³

et al. 2020

Liq. Cryst. and their Appl.

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“…Основной экспериментально определяемой характеристикой являлся удельный объем удерживания сорбатов Vg T (см 3…”

Section: экспериментunclassified

“…В последнее время все большее значение приобретает конструирование супрамолекулярных жидкокристаллических систем, в которых структурными единицами являются не индивидуальные молекулы жидких кристаллов (ЖК), а их ассоциаты, преимущественно димеры, образующиеся за счет специфических взаимодействий протоно-и электронодонорных заместителей [1][2][3]. Кроме индивидуальных супрамолекулярных мезогенов вызывают интерес их смеси с макроциклическими соединениями, способными к комплексообразованию с органическими молекулами, в том числе по типу «гостьхозяин».…”

Section: Introductionunclassified

Sorption and Isomerselective Properties of Binary Sorbent Based on Supramolecular 4-(3-Hydroxypropyloxy)-4'-Formylazobenzene Liquid Crystal and Partially Methylated β-Cyclodextrin

Onuchak¹,

Tugareva²,

Kapralova³

et al. 2020

Liq. Cryst. and their Appl.

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The sorption and selective properties of a composite sorbent based on the supramolecular liquid crystal 4-(3-hydroxypropyloxy)-4'-formylazobenzene (HPOFAB) and partially methylated β-cyclodextrin heptakis-(2,6-di-O-methyl)-β-cyclodextrin (Me2,6-β-CD) have been studied by inverse gas chromatography. The standard thermodynamic functions of sorption on the smectic A phase of the sorbent for 29 volatile organic compounds of different classes were determined and compared with similar functions obtained on a column with “pure” HPOFAB. The reasons for the increase in the retention of all studied compounds (except for the optical isomers of butanediol-2,3) when Me2,6-β-CD (10 wt. %) added to HPOFAB are discussed. It was found that the mixed SA phase of the binary sorbent in conditions of gas-liquid chromatography has moderate values of structural selectivity and enantioselectivity to both low-polar terpene hydrocarbons and polar optical isomers (butanediols-2,3).

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Technological development of the bio‐based 2,3‐butanediol process

Tinôco

Borschiver

Coutinho

et al. 2020

Biofuels Bioprod Bioref

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The biotechnological production of 2,3‐butanediol (2,3‐BDO) has economic and environmental advantages over the chemical route, although its large‐scale implementation has not yet been consolidated. To establish the technological maturity of the bio‐based 2,3‐BDO process, and the factors limiting its industrial use, a technology roadmap was built from patents and scientific articles, in which four drivers were identified: production process, recovery process, product, and application. The production process driver was reported in 53.25% of documents, notably including studies on substrates, engineered microorganisms, efficient production methods, and nutritional supplementation. The recovery process driver was investigated in 23.5% of studies, with conventional distillation and solvent extraction being the main technologies performed on a large scale. Product and application drivers accounted for 9.25% and 14% of studies, respectively, highlighting the chemical intermediates, plastics, food additives, and cosmetics market segments. A limited number of companies like LanzaTech and GS Caltex Corporation already produce industrially bio‐based 2,3‐BDO, while academic centers such as the Yancheng Institute of Technology are focused to the laboratory scale with technologies to be implemented in the long term. This study can therefore help to establish and gain an understanding of the necessary strategies to consolidate the industrial production of bio‐based 2,3‐BDO in the future. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd

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Orientational effects of h-bonding in the chirality transfer from (2R,3R)‑(−)‑2,3-butandiol to polar nematic liquid crystal

Cited by 12 publications

References 20 publications

Influence of 4-(2-S(+)-Methylbutyloxy)Benzoic Acid on Mesomorphic and Physico-Chemical Properties of 4-Butyl-4'-Octanoyloxyazobenzene

Influence of 4-(2-S(+)-Methylbutyloxy)Benzoic Acid on Mesomorphic and Physico-Chemical Properties of 4-Butyl-4'-Octanoyloxyazobenzene

Sorption and Isomerselective Properties of Binary Sorbent Based on Supramolecular 4-(3-Hydroxypropyloxy)-4'-Formylazobenzene Liquid Crystal and Partially Methylated β-Cyclodextrin

Technological development of the bio‐based 2,3‐butanediol process

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