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Supramolecular complexes based on 4-n-alkoxycinnamic acids and pyridine derivatives: Mesomorphic properties and prospects of applying to tribosystemsстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 24 сентября 2020 г.
- Авторы: Syrbu Svetlana A., Fedorov Mikhail S., Giricheva Nina I., Novikov Victor V., Filippov Ivan A., Kiselev Mikhail R.
- Журнал: Journal of Molecular Liquids
- Том: 305
- Год издания: 2020
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 112796
- DOI: 10.1016/j.molliq.2020.112796
- Аннотация: The processes of self-assembly by hydrogen-bonding in the system of 4-n-alkoxycinnamic acid molecules (n-AOCA) with short hydrocarbon fragments (n = 2, 3), 4,4′-bipyridine (BPy) and 1,2-bis (4-pyridyl) ethane (BPyE) have been considered. The formation of hydrogen bonded (HB) complexes n-AOCA···BPy/BPyE···n-AOCA was confirmed by IR spectroscopy and quantum-chemical calculations.The liquid crystal properties of HB-complexes were studied by differential scanning calorimetry and polarization thermomicroscopy. The interrelation of mesomorphic properties with the structure of the obtained supramolecules n-AOCA···BP/BPE···n-AOCA was analyzed. It is shown that the nematic mesophase of HB-complexes has less thermal stability and is formed at lower temperatures than mesophase of individual 4-n-alkoxycinnamic acids. These trends are more pronounced in systems with 1,2-bis(4-pyridyl)ethane than in systems with 4,4′-bipyridine. While testing the boundary friction, it was found that saturated solutions of HB-complexes in Vaseline oil slightly reduce the friction coefficient and significantly increase the lubricating film durability (6–7 times) under conditions of depleted lubrication compared to a base solvent.
- Добавил в систему: Киселев Михаил Романович