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Ahmed HA, Abolibda TZ, Ismail YAM, Almohammedi A, Aly KA, Ibrahim MS, Gomha SM. Novel maleic anhydride derivatives: liquid crystalline materials with enhanced mesomorphic and optical characteristics. Front Chem 2023; 11:1287883. [PMID: 38025055 PMCID: PMC10665853 DOI: 10.3389/fchem.2023.1287883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Accepted: 10/30/2023] [Indexed: 12/01/2023] Open
Abstract
A new class of liquid crystalline materials, 4-(2,5-dioxo-2,5-dihydro-1H-pyrrol-1-yl)phenyl 4-(alkoxy)benzoates (Mn), derived from maleic anhydride, was synthesized and studied for mesomorphic and optical properties. These materials consist of three derivatives with varying terminal flexible chain lengths (6-12 carbons) linked to the phenyl ring near the ester bond. The study employed differential scanning calorimetry and polarized optical microscopy (POM) to characterize the mesomorphic properties. Molecular structures were elucidated using elemental analysis, FT-IR, and NMR spectroscopy. The findings reveal that all the synthesized maleic anhydride derivatives exhibit enantiotropic nematic (N) mesophases. The insertion of the heterocyclic maleic anhydride moiety into the molecular structure influences the stability and range of the N phase. Additionally, entropy changes during N-isotropic transitions are of small magnitude and exhibit non-linear trends independent of the terminal alkoxy chain length (n). This suggests that the ester linkage group does not significantly promote molecular biaxiality, and the clearing temperature values are relatively high. By comparing the investigated materials with their furan derivatives found in existing literature, it was established that the substitution examined in this study induces the formation of nematic phases.
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Affiliation(s)
- Hoda A. Ahmed
- Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt
- Chemistry Department, College of Sciences, Taibah University, Yanbu, Saudi Arabia
| | - Tariq Z. Abolibda
- Department of Chemistry, Faculty of Science, Islamic University of Madinah, Madinah, Saudi Arabia
| | - Yasser A. M. Ismail
- Department of Physics, Faculty of Science, Islamic University of Madinah, Madinah, Saudi Arabia
| | - Abdullah Almohammedi
- Department of Physics, Faculty of Science, Islamic University of Madinah, Madinah, Saudi Arabia
| | - K. A. Aly
- Department of Physics, Collage of Science and Arts Khylais, University of Jeddah, Khulais, Saudi Arabia
- Department of Physics, Faculty of Science, Al-Azhar University, Assiut Branch, Assiut, Egypt
| | - Mohamed S. Ibrahim
- Department of Chemistry, Faculty of Science, Islamic University of Madinah, Madinah, Saudi Arabia
| | - Sobhi M. Gomha
- Department of Chemistry, Faculty of Science, Islamic University of Madinah, Madinah, Saudi Arabia
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Ali GQ, Tomi IHR. Non-symmetrical bent-core homologous series bearing 1,2,4-oxadiazole core with a cholesterol terminal arm: Synthesis, characterization and their liquid crystalline properties. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132610] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Huang H, Cong Y, Du A, Hu B, Li J, Zhang B. Liquid crystalline dimers containing a cholesteryl group: Chiral smectic phases, and re-entrant TGBA* phase. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117920] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Shanker G, Srinatha M, Sandhya Kumari D, Ranjitha B, Alaasar M. Novel green synthetic approach for liquid crystalline materials using multi-component reactions. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Veerabhadraswamy BN, Bhat SA, Hiremath US, Yelamaggad CV. Light-Emitting Chiral Nematic Dimers with Anomalous Odd-Even Effect. Chemphyschem 2019; 20:2836-2851. [PMID: 31517434 DOI: 10.1002/cphc.201900716] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 09/12/2019] [Indexed: 11/06/2022]
Abstract
In this report, based on the results derived from the extensive study into the thermal and photophysical properties, an anomalous mesomorphic behavior of photoluminescent, chiral nematic (N*) liquid crystalline dimers, belonging to two different series has been revealed. They comprise cholesterol and fluorescent three-ring Schiff base or salicylaldimine core interlinked via an ω-oxyalkanoyloxy spacer of varying length and parity. The effect of molecular structure on the liquid crystal (LC) behavior and photophysical properties of both the series has been probed by varying the length of the terminal n-alkoxy tails for a fixed (odd or even) parity of the spacer. The detailed investigations using complementary techniques not only evidenced the existence of the N* phase in all the dimers synthesized but also the occurrence of an intriguing odd-even effect; blue phases (BPs) exist in all the dimers comprising even-membered spacer, which surprisingly remains totally absent in their odd-membered counterparts. While the results reported hitherto are exactly opposite to the aforesaid findings, this atypical behavior has been interpreted in terms of the over-all shape of the dimers rendered by the orientation of terminal tails. Photophysical studies carried out clearly revealed the intrinsic light emitting feature of the dimers not only in their dilute solutions but also in their three condensed states viz., solid, N* phase, and isotropic liquid state; the emission intensities of the N* phase varies with the change in temperature, as expected. CD spectra of the N* phase recorded as a function of temperature show bisignate CD band characteristically, signifying large chiral correlations in the molecular self-assembly, while the origin of bands from positive to negative region suggests a right-handed twist of the N* helix.
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Affiliation(s)
- B N Veerabhadraswamy
- Centre for Nano and Soft Matter Sciences, P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli, Bengaluru, 560 013, INDIA
| | - Sachin A Bhat
- Centre for Nano and Soft Matter Sciences, P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli, Bengaluru, 560 013, INDIA
| | - Uma S Hiremath
- Centre for Nano and Soft Matter Sciences, P. B. No. 1329, Prof. U. R. Rao Road, Jalahalli, Bengaluru, 560 013, INDIA
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Sharma VS, Shah AP, Sharma AS. A new class of supramolecular liquid crystals derived from azo calix[4]arene functionalized 1,3,4-thiadiazole derivatives. NEW J CHEM 2019. [DOI: 10.1039/c8nj04997a] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new class of bowl-shaped supramolecular liquid crystals (LCs) is described derived from calix[4]arene substituted with 1,3,4-thiadiazole derivatives, inbuilt with Schiff base and ester on the lower rim and with an azo group on the upper rim with an alkyl side chain (–OC3H7, –OC8H17).
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Affiliation(s)
- Vinay S. Sharma
- Department of Chemistry
- Faculty of Basic and Applied Science
- Madhav University
- Sirohi
- India
| | | | - Anuj S. Sharma
- Department of Chemistry
- School of Science
- Gujarat University
- Ahmedabad
- India
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Nayak RA, Bhat SA, Shanker G, Rao DSS, Yelamaggad CV. Highly frustrated liquid crystal phases in optically active dimers: synthesis and rich phase transitional behavior. NEW J CHEM 2019. [DOI: 10.1039/c8nj03520b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
New cholesterol-based Schiff base dimers exhibit a rich mesomorphism.
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Affiliation(s)
- Rashmi Ashwathama Nayak
- Centre for Nano and Soft Matter Sciences
- P. B. No. 1329
- Prof. U. R. Rao Road
- Jalahalli
- Bengaluru 560013
| | - Sachin A. Bhat
- Centre for Nano and Soft Matter Sciences
- P. B. No. 1329
- Prof. U. R. Rao Road
- Jalahalli
- Bengaluru 560013
| | - G. Shanker
- Department of Chemistry
- Jnana Bharathi Campus
- Sneha Bhavan
- Bangalore University
- Bengaluru
| | - D. S. Shankar Rao
- Centre for Nano and Soft Matter Sciences
- P. B. No. 1329
- Prof. U. R. Rao Road
- Jalahalli
- Bengaluru 560013
| | - C. V. Yelamaggad
- Centre for Nano and Soft Matter Sciences
- P. B. No. 1329
- Prof. U. R. Rao Road
- Jalahalli
- Bengaluru 560013
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Zhang K, Bai Y, Feng C, Ning G, Ni H, Yu W, Zhao K, Wang B, Hu P. Synthesis and characterization of new H-shaped triphenylene discotic room-temperature liquid crystal tetramers by a copper-free click reaction. NEW J CHEM 2018. [DOI: 10.1039/c7nj02695a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of new H-shaped triphenylene discotic liquid crystal tetramers has been designed and synthesized using a copper-free [3+2] cycloaddition reaction.
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Affiliation(s)
- Kan Zhang
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Yuefeng Bai
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Chun Feng
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Guanghui Ning
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Hailiang Ni
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Wenhao Yu
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Keqing Zhao
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Biqin Wang
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
| | - Ping Hu
- College of Chemistry and Materials Science
- Sichuan Normal University
- Chengdu
- P. R. China
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Xiao Y, Gao H, Wang T, Zhang R, Cheng X. Synthesis, liquid-crystalline, photophysical and chemosensor properties of oxadiazole/thiadiazole-based amphiphiles with glycerol groups. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.08.110] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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