Polar-end 3,5-diarylisoxazole liquid crystals with SmA and highly ordered CrE mesophases

Caroline S.B. Weber; Rafaela R. da Rosa; Bruno B. de Araújo; Lindiomar B. Avila; Leonardo N. Furini; Ivan H. Bechtold; Juliana Eccher; Aloir A. Merlo

doi:10.1039/d4tc04393f

Polar-end 3,5-diarylisoxazole liquid crystals with SmA and highly ordered CrE mesophases

Caroline S.B. Weber, Rafaela R. da Rosa, Bruno B. de Araújo, Lindiomar B. Avila, Leonardo N. Furini, Ivan H. Bechtold, Juliana Eccher, Aloir A. Merlo

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

Polar-end 3,5-diarylisoxazol liquid crystals (ILCs) with nitro, amine and bromine polar terminal groups were thermally and structurally characterized. The nitro and bromo terminated compounds exhibited the highly ordered CrE mesophase below the conventional SmA. X-ray data obtained for the SmA mesophase showed that the structural organization of this phase evolves from monolayer SmA₁ (Br), to interdigitated SmA_d (NO₂), and to quasi-bilayer SmA₂ (NH₂). The optical band gap and photoluminescence quantum yields are strongly dependent on the terminal groups and complementary DFT calculations supported the experimental observations. Direct current (DC) electrical measurements demonstrated a significant dependence on temperature, exhibiting increased conductivity at elevated temperatures, regardless of the mesophase. Alternating current (AC) electrical measurements suggested the presence of ionic conduction, with a huge increase in capacitance at low frequencies.

Original language	English
Pages (from-to)	1419 - 1428
Journal	Journal of Materials Chemistry C
Volume	13
Issue number	3
DOIs	https://doi.org/10.1039/d4tc04393f
Publication status	Published - 19 Nov 2024

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@article{9f1600f29923485aa86722dc5c44148c,

title = "Polar-end 3,5-diarylisoxazole liquid crystals with SmA and highly ordered CrE mesophases",

abstract = "Polar-end 3,5-diarylisoxazol liquid crystals (ILCs) with nitro, amine and bromine polar terminal groups were thermally and structurally characterized. The nitro and bromo terminated compounds exhibited the highly ordered CrE mesophase below the conventional SmA. X-ray data obtained for the SmA mesophase showed that the structural organization of this phase evolves from monolayer SmA1 (Br), to interdigitated SmAd (NO2), and to quasi-bilayer SmA2 (NH2). The optical band gap and photoluminescence quantum yields are strongly dependent on the terminal groups and complementary DFT calculations supported the experimental observations. Direct current (DC) electrical measurements demonstrated a significant dependence on temperature, exhibiting increased conductivity at elevated temperatures, regardless of the mesophase. Alternating current (AC) electrical measurements suggested the presence of ionic conduction, with a huge increase in capacitance at low frequencies.",

author = "Weber, {Caroline S.B.} and {da Rosa}, {Rafaela R.} and {de Ara{\'u}jo}, {Bruno B.} and Avila, {Lindiomar B.} and Furini, {Leonardo N.} and Bechtold, {Ivan H.} and Juliana Eccher and Merlo, {Aloir A.}",

note = "Funding Information: We thank CAPES (finance code #001), CNPq PQ2023 no. 311195/2023-7, Fapergs/Edital 07/2021 no. 21/2551-0002121-7, 07/2022 no. 23/2551-0000114-4, FAPESC, INCT/INEO and H2020-MSCA-RISE-2017 (OCTA, #778158) for the financial support. The XRD and DSC experiments were carried out in the Laborat{\'o}rio de Difra{\c c}{\~a}o de Raios X (LDRX/UFSC) and Laborat{\'o}rio Multiusu{\'a}rio de An{\'a}lise T{\'e}rmica (LAMAT/IQ/UFRGS). A. A. M. thanks Prof. Harald Bock (CRPP, Bordeaux, France) for the English language review of the article Publisher Copyright: {\textcopyright} 2024 The Royal Society of Chemistry.",

year = "2024",

month = nov,

day = "19",

doi = "10.1039/d4tc04393f",

language = "English",

volume = "13",

pages = "1419 -- 1428",

journal = "Journal of Materials Chemistry C",

issn = "2050-7526",

publisher = "RSC - Royal Society of Chemistry",

number = "3",

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TY - JOUR

T1 - Polar-end 3,5-diarylisoxazole liquid crystals with SmA and highly ordered CrE mesophases

AU - Weber, Caroline S.B.

AU - da Rosa, Rafaela R.

AU - de Araújo, Bruno B.

AU - Avila, Lindiomar B.

AU - Furini, Leonardo N.

AU - Bechtold, Ivan H.

AU - Eccher, Juliana

AU - Merlo, Aloir A.

N1 - Funding Information: We thank CAPES (finance code #001), CNPq PQ2023 no. 311195/2023-7, Fapergs/Edital 07/2021 no. 21/2551-0002121-7, 07/2022 no. 23/2551-0000114-4, FAPESC, INCT/INEO and H2020-MSCA-RISE-2017 (OCTA, #778158) for the financial support. The XRD and DSC experiments were carried out in the Laboratório de Difração de Raios X (LDRX/UFSC) and Laboratório Multiusuário de Análise Térmica (LAMAT/IQ/UFRGS). A. A. M. thanks Prof. Harald Bock (CRPP, Bordeaux, France) for the English language review of the article Publisher Copyright: © 2024 The Royal Society of Chemistry.

PY - 2024/11/19

Y1 - 2024/11/19

N2 - Polar-end 3,5-diarylisoxazol liquid crystals (ILCs) with nitro, amine and bromine polar terminal groups were thermally and structurally characterized. The nitro and bromo terminated compounds exhibited the highly ordered CrE mesophase below the conventional SmA. X-ray data obtained for the SmA mesophase showed that the structural organization of this phase evolves from monolayer SmA1 (Br), to interdigitated SmAd (NO2), and to quasi-bilayer SmA2 (NH2). The optical band gap and photoluminescence quantum yields are strongly dependent on the terminal groups and complementary DFT calculations supported the experimental observations. Direct current (DC) electrical measurements demonstrated a significant dependence on temperature, exhibiting increased conductivity at elevated temperatures, regardless of the mesophase. Alternating current (AC) electrical measurements suggested the presence of ionic conduction, with a huge increase in capacitance at low frequencies.

AB - Polar-end 3,5-diarylisoxazol liquid crystals (ILCs) with nitro, amine and bromine polar terminal groups were thermally and structurally characterized. The nitro and bromo terminated compounds exhibited the highly ordered CrE mesophase below the conventional SmA. X-ray data obtained for the SmA mesophase showed that the structural organization of this phase evolves from monolayer SmA1 (Br), to interdigitated SmAd (NO2), and to quasi-bilayer SmA2 (NH2). The optical band gap and photoluminescence quantum yields are strongly dependent on the terminal groups and complementary DFT calculations supported the experimental observations. Direct current (DC) electrical measurements demonstrated a significant dependence on temperature, exhibiting increased conductivity at elevated temperatures, regardless of the mesophase. Alternating current (AC) electrical measurements suggested the presence of ionic conduction, with a huge increase in capacitance at low frequencies.

UR - http://www.scopus.com/inward/record.url?scp=85210410932&partnerID=8YFLogxK

U2 - 10.1039/d4tc04393f

DO - 10.1039/d4tc04393f

M3 - Article

AN - SCOPUS:85210410932

SN - 2050-7526

VL - 13

SP - 1419

EP - 1428

JO - Journal of Materials Chemistry C

JF - Journal of Materials Chemistry C

IS - 3

ER -

Polar-end 3,5-diarylisoxazole liquid crystals with SmA and highly ordered CrE mesophases

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