The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic Phases
We have designed new chiral smectic mesogens with the -CH<sub>2</sub>O group near the chiral center. We synthesized two unique rod-like compounds. We determined the mesomorphic properties of these mesogens and confirmed the phase identification using dielectric spectroscopy. Depending on...
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2024-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/17/3/618 |
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| author | Magdalena Urbańska Monika Zając Paweł Perkowski Aleksandra Deptuch |
| author_facet | Magdalena Urbańska Monika Zając Paweł Perkowski Aleksandra Deptuch |
| author_sort | Magdalena Urbańska |
| collection | DOAJ |
| description | We have designed new chiral smectic mesogens with the -CH<sub>2</sub>O group near the chiral center. We synthesized two unique rod-like compounds. We determined the mesomorphic properties of these mesogens and confirmed the phase identification using dielectric spectroscopy. Depending on the length of the oligomethylene spacer (i.e., the number of methylene groups) in the achiral part of the molecules, the studied materials show different phase sequences. Moreover, the temperature ranges of the observed smectic phases are different. It can be seen that as the length of the alkyl chain increases, the liquid crystalline material shows more mesophases. Additionally, its clearing (isotropization) temperature increases. The studied compounds are compared with the structurally similar smectogens previously synthesized. The helical pitch measurements were performed using the selective reflection method. These materials can be useful and effective as chiral components and dopants in smectic mixtures targeted for optoelectronics and photonics. |
| first_indexed | 2024-03-08T03:53:51Z |
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| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T03:53:51Z |
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| series | Materials |
| spelling | doaj.art-9ad926dc8ad84bef96d8672f812fe9c22024-02-09T15:17:28ZengMDPI AGMaterials1996-19442024-01-0117361810.3390/ma17030618The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic PhasesMagdalena Urbańska0Monika Zając1Paweł Perkowski2Aleksandra Deptuch3Institute of Chemistry, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Chemistry, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Applied Physics, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, PolandInstitute of Nuclear Physics Polish Academy of Sciences, Radzikowskiego 152, 31-342 Krakow, PolandWe have designed new chiral smectic mesogens with the -CH<sub>2</sub>O group near the chiral center. We synthesized two unique rod-like compounds. We determined the mesomorphic properties of these mesogens and confirmed the phase identification using dielectric spectroscopy. Depending on the length of the oligomethylene spacer (i.e., the number of methylene groups) in the achiral part of the molecules, the studied materials show different phase sequences. Moreover, the temperature ranges of the observed smectic phases are different. It can be seen that as the length of the alkyl chain increases, the liquid crystalline material shows more mesophases. Additionally, its clearing (isotropization) temperature increases. The studied compounds are compared with the structurally similar smectogens previously synthesized. The helical pitch measurements were performed using the selective reflection method. These materials can be useful and effective as chiral components and dopants in smectic mixtures targeted for optoelectronics and photonics.https://www.mdpi.com/1996-1944/17/3/618synthesisferroelectricantiferroelectrichelical pitchdielectric spectroscopyX-ray diffraction |
| spellingShingle | Magdalena Urbańska Monika Zając Paweł Perkowski Aleksandra Deptuch The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic Phases Materials synthesis ferroelectric antiferroelectric helical pitch dielectric spectroscopy X-ray diffraction |
| title | The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic Phases |
| title_full | The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic Phases |
| title_fullStr | The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic Phases |
| title_full_unstemmed | The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic Phases |
| title_short | The Influence of the Molecular Structure of Compounds on Their Properties and the Occurrence of Chiral Smectic Phases |
| title_sort | influence of the molecular structure of compounds on their properties and the occurrence of chiral smectic phases |
| topic | synthesis ferroelectric antiferroelectric helical pitch dielectric spectroscopy X-ray diffraction |
| url | https://www.mdpi.com/1996-1944/17/3/618 |
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