Photosensitive bent-core nematic liquid crystals with various linking units in the side arms: Structure-properties relationships

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F20%3A43921645" target="_blank" >RIV/60461373:22310/20:43921645 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378271:_____/20:00531928

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0167732219349359" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0167732219349359</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.molliq.2020.112743" target="_blank" >10.1016/j.molliq.2020.112743</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photosensitive bent-core nematic liquid crystals with various linking units in the side arms: Structure-properties relationships

Popis výsledku v původním jazyce

We present two isomeric series of photosensitive bent-core liquid crystals possessing a lateral chlorine atom in the central resorcinol unit and various linking units in the side arms. With the aim to tune properties of the nematic phase, we have varied the type of the linking unit in the lengthening arm with rising rigidity from benzoate ester, biphenyl, cinnamate, Schiff base to stilbene moieties. In addition to that, we have changed the position of the lateral substituent (chlorine) as well. The mesomorphic properties of the materials have been determined from differential scanning calorimetry, polarizing optical microscopy, dielectric spectroscopy and X-ray studies. We show that synergy of the linking unit with the effect of the lateral substituent gives rise to broad temperature range of mesophases - the nematic phase as well as a SmCP phase. Thanks to the presence of the photosensitive group in the molecular structure, we have been able to transform both mesophases to the isotropic phase under UV light. The chemical structure-mesomorphic properties relationships are discussed with the aid of ab initio calculations and the results presented in context with experimental data. (C) 2020 Elsevier B.V. All rights reserved.

Název v anglickém jazyce

Photosensitive bent-core nematic liquid crystals with various linking units in the side arms: Structure-properties relationships

Popis výsledku anglicky

We present two isomeric series of photosensitive bent-core liquid crystals possessing a lateral chlorine atom in the central resorcinol unit and various linking units in the side arms. With the aim to tune properties of the nematic phase, we have varied the type of the linking unit in the lengthening arm with rising rigidity from benzoate ester, biphenyl, cinnamate, Schiff base to stilbene moieties. In addition to that, we have changed the position of the lateral substituent (chlorine) as well. The mesomorphic properties of the materials have been determined from differential scanning calorimetry, polarizing optical microscopy, dielectric spectroscopy and X-ray studies. We show that synergy of the linking unit with the effect of the lateral substituent gives rise to broad temperature range of mesophases - the nematic phase as well as a SmCP phase. Thanks to the presence of the photosensitive group in the molecular structure, we have been able to transform both mesophases to the isotropic phase under UV light. The chemical structure-mesomorphic properties relationships are discussed with the aid of ab initio calculations and the results presented in context with experimental data. (C) 2020 Elsevier B.V. All rights reserved.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Projekt

<a href="/cs/project/GA19-03564S" target="_blank" >GA19-03564S: Inteligentní supramolekulární fotochromní nanostruktury</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Molecular Liquids

ISSN

0167-7322

e-ISSN

—

Svazek periodika

306

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

—

Kód UT WoS článku

000534192100039

EID výsledku v databázi Scopus

—