Nematic Phases in Photo-Responsive Hydrogen-Bonded Liquid Crystalline Dimers
We report on the preparation and characterization of a new family of hydrogen-bonded nematogenic liquid crystalline dimers. The dimers are supramolecular complexes that consist of a benzoic acid derivative, acting as the proton donor, featuring a spacer with seven methylene groups and a terminal dec...
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MDPI AG
2025-06-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/15/6/576 |
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| author | Christian Anders Muhammad Abu Bakar Tejal Nirgude Mohamed Alaasar |
| author_facet | Christian Anders Muhammad Abu Bakar Tejal Nirgude Mohamed Alaasar |
| author_sort | Christian Anders |
| collection | DOAJ |
| description | We report on the preparation and characterization of a new family of hydrogen-bonded nematogenic liquid crystalline dimers. The dimers are supramolecular complexes that consist of a benzoic acid derivative, acting as the proton donor, featuring a spacer with seven methylene groups and a terminal decyloxy chain, paired with an azopyridine derivative as the proton acceptor. The latter was either fluorinated or nonfluorinated with variable alkoxy chain length. The formation of a hydrogen bond between the individual components was confirmed using FTIR and <sup>1</sup>H NMR spectroscopy. All supramolecules were investigated for their liquid crystalline behaviour via a polarized optical microscope (POM) and differential scanning calorimetry (DSC). All materials exhibit enantiotropic nematic phases as confirmed by X-ray diffraction (XRD) and POM investigations. The nematic phase range depends strongly on the degree and position of fluorine atoms. Additionally, the supramolecules demonstrated a rapid and reversible transition between the liquid crystal phase and the isotropic liquid state because of <i>trans-cis</i> photoisomerization upon light irradiation. Therefore, this study presents a straightforward approach to design photo-responsive nematic materials, which could be of interest for nonlinear optics applications. |
| format | Article |
| id | doaj-art-fa2b6c92ca5e441d894c90c57b8b93b7 |
| institution | Kabale University |
| issn | 2073-4352 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | MDPI AG |
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| series | Crystals |
| spelling | doaj-art-fa2b6c92ca5e441d894c90c57b8b93b72025-08-20T03:24:39ZengMDPI AGCrystals2073-43522025-06-0115657610.3390/cryst15060576Nematic Phases in Photo-Responsive Hydrogen-Bonded Liquid Crystalline DimersChristian Anders0Muhammad Abu Bakar1Tejal Nirgude2Mohamed Alaasar3Institute of Chemistry, Martin Luther University Halle-Wittenberg, 06120 Halle Saale, GermanyInstitute of Chemistry, Martin Luther University Halle-Wittenberg, 06120 Halle Saale, GermanyInstitute of Chemistry, Martin Luther University Halle-Wittenberg, 06120 Halle Saale, GermanyInstitute of Chemistry, Martin Luther University Halle-Wittenberg, 06120 Halle Saale, GermanyWe report on the preparation and characterization of a new family of hydrogen-bonded nematogenic liquid crystalline dimers. The dimers are supramolecular complexes that consist of a benzoic acid derivative, acting as the proton donor, featuring a spacer with seven methylene groups and a terminal decyloxy chain, paired with an azopyridine derivative as the proton acceptor. The latter was either fluorinated or nonfluorinated with variable alkoxy chain length. The formation of a hydrogen bond between the individual components was confirmed using FTIR and <sup>1</sup>H NMR spectroscopy. All supramolecules were investigated for their liquid crystalline behaviour via a polarized optical microscope (POM) and differential scanning calorimetry (DSC). All materials exhibit enantiotropic nematic phases as confirmed by X-ray diffraction (XRD) and POM investigations. The nematic phase range depends strongly on the degree and position of fluorine atoms. Additionally, the supramolecules demonstrated a rapid and reversible transition between the liquid crystal phase and the isotropic liquid state because of <i>trans-cis</i> photoisomerization upon light irradiation. Therefore, this study presents a straightforward approach to design photo-responsive nematic materials, which could be of interest for nonlinear optics applications.https://www.mdpi.com/2073-4352/15/6/576azopyridinehydrogen bondingfluorinenematic phaseliquid crystals |
| spellingShingle | Christian Anders Muhammad Abu Bakar Tejal Nirgude Mohamed Alaasar Nematic Phases in Photo-Responsive Hydrogen-Bonded Liquid Crystalline Dimers Crystals azopyridine hydrogen bonding fluorine nematic phase liquid crystals |
| title | Nematic Phases in Photo-Responsive Hydrogen-Bonded Liquid Crystalline Dimers |
| title_full | Nematic Phases in Photo-Responsive Hydrogen-Bonded Liquid Crystalline Dimers |
| title_fullStr | Nematic Phases in Photo-Responsive Hydrogen-Bonded Liquid Crystalline Dimers |
| title_full_unstemmed | Nematic Phases in Photo-Responsive Hydrogen-Bonded Liquid Crystalline Dimers |
| title_short | Nematic Phases in Photo-Responsive Hydrogen-Bonded Liquid Crystalline Dimers |
| title_sort | nematic phases in photo responsive hydrogen bonded liquid crystalline dimers |
| topic | azopyridine hydrogen bonding fluorine nematic phase liquid crystals |
| url | https://www.mdpi.com/2073-4352/15/6/576 |
| work_keys_str_mv | AT christiananders nematicphasesinphotoresponsivehydrogenbondedliquidcrystallinedimers AT muhammadabubakar nematicphasesinphotoresponsivehydrogenbondedliquidcrystallinedimers AT tejalnirgude nematicphasesinphotoresponsivehydrogenbondedliquidcrystallinedimers AT mohamedalaasar nematicphasesinphotoresponsivehydrogenbondedliquidcrystallinedimers |