Unusual polymorphism in new bent-shaped liquid crystals based on biphenyl as a central molecular core
| العنوان: | Unusual polymorphism in new bent-shaped liquid crystals based on biphenyl as a central molecular core |
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| المؤلفون: | Ewa Gorecka, Jiří Svoboda, Damian Pociecha, Svatopluk Světlík, Natalia Podoliak, Anna Kovářová, Václav Kozmík, Vladimíra Novotná |
| المصدر: | Beilstein Journal of Organic Chemistry Beilstein Journal of Organic Chemistry, Vol 10, Iss 1, Pp 794-807 (2014) |
| بيانات النشر: | Beilstein Institut, 2014. |
| سنة النشر: | 2014 |
| مصطلحات موضوعية: | Biphenyl, biphenyl core, Chemistry, Stereochemistry, Mesogen, Organic Chemistry, Bent molecular geometry, Dielectric, Full Research Paper, SmCG phase, Dielectric spectroscopy, lcsh:QD241-441, Molecular dynamics, chemistry.chemical_compound, liquid crystals, lcsh:Organic chemistry, Liquid crystal, bent-shaped, lcsh:Q, Lamellar structure, mesomorphic behaviour, lcsh:Science |
| الوصف: | Bent-shaped mesogens possessing a biphenyl as a central core have been synthesized and the role of the terminal chain and the orientation of the ester as a linkage group have been investigated. For the studied molecular core we have established that both parameters play an important role for the mesomorphic properties. The polyfluoroalkyl terminal chain supports the formation of mesophases, and the introduction of a chiral lactate terminal chain destabilizes mesophases for the first type of mutual orientation of ester groups, attached to the central core. On the contrary, for the opposite orientation of esters, the terminal chain has no effect on the mesomorphic properties, and columnar phases have been found for all compounds. A unique phase sequence has been found for the mesogen with the fluorinated chain. A generalized tilted smectics, SmCG, have been observed in a temperature interval between two different lamellar SmCP phases and characterized by X-ray and dielectric measurements. The dielectric spectroscopy data are unique and presented for the first time in the SmCG phase providing new information about the molecular dynamics. |
| تدمد: | 1860-5397 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ea8a946e32699c5064fdeb09c1fc840 https://doi.org/10.3762/bjoc.10.75 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....7ea8a946e32699c5064fdeb09c1fc840 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 18605397 |
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