Počet záznamů: 1
All-organic liquid crystalline radicals with a spin unit in the outer position of a bent-core system
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SYSNO ASEP 0469775 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název All-organic liquid crystalline radicals with a spin unit in the outer position of a bent-core system Tvůrce(i) Bajzíková, A. (CZ)
Kohout, M. (CZ)
Tarábek, Ján (UOCHB-X) RID, ORCID
Svoboda, J. (CZ)
Novotná, Vladimíra (FZU-D) RID, ORCID, SAI
Vejpravová, Jana (FZU-D) RID, ORCID
Pociecha, D. (PL)
Gorecka, E. (PL)Zdroj.dok. Journal of Materials Chemistry C. - : Royal Society of Chemistry - ISSN 2050-7526
Roč. 4, č. 48 (2016), s. 11540-11547Poč.str. 8 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova mesogenic cores ; ester groups ; rigid core Vědní obor RIV CF - Fyzikální chemie a teoretická chemie CEP GA15-02843S GA ČR - Grantová agentura ČR Institucionální podpora UOCHB-X - RVO:61388963 ; FZU-D - RVO:68378271 UT WOS 000390787600022 EID SCOPUS 85003875708 DOI https://doi.org/10.1039/c6tc04346a Anotace All-organic paramagnetic liquid crystals offer the advantage of a long-range order of liquid crystalline phases and the magnetic properties of the individual molecules. In such systems, the magnetic properties can be modified by phase transition or the application of external fields. This manuscript reports on paramagnetic all-organic bent-core liquid crystals having the radical-bearing unit (TEMPO) in the terminal position of an elongating side arm. The mesomorphic properties of the materials are ensured by the optimized molecular structure. The paramagnetic nature of the mesogenic materials is investigated by electron paramagnetic resonance, the magnetic properties of the bulk materials are studied by SQUID magnetometry. It is shown that the materials preserve their magnetic properties within the whole temperature range of liquid crystalline behaviour. Moreover, a strong correlation between spin orientation and molecular alignment within different mesophases has been observed, however, SQUID measurements do not provide evidence about spin glass formation. Unlike materials presented thus far, the position of the spin unit has a plausible effect on the formation of mesophases leading to unique polymorphism of the studied paramagnetic compounds. For two six-ring hockey-stick-like compounds, polymorphism with four different mesophases, including two B-1Rev-type phases, has been found in a broad temperature range (about 20 degrees C each). Thus, for the first time, such behaviour is described for all-organic paramagnetic bent-core liquid crystals. Pracoviště Ústav organické chemie a biochemie Kontakt asep@uochb.cas.cz ; Kateřina Šperková, Tel.: 232 002 584 ; Jana Procházková, Tel.: 220 183 418 Rok sběru 2017
Počet záznamů: 1