Thermotropic Liquid Crystals as Novel Functional Materials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Liquid Crystals".

Deadline for manuscript submissions: 10 December 2025 | Viewed by 644

Special Issue Editors


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“Cristofor Simionescu” Faculty of Chemical Engineering and Environmental Protection, “Gheorghe Asachi” Technical University, 700050 Iasi, Romania
Interests: organic synthesis; bent-core liquid crystals; thermotropic properties; thermal properties; structural characterisation
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Special Issue Information

Dear Colleagues,

The design and synthesis of new functional materials is essential nowadays, considering the explosive growth of technological applications that require compounds with suitable physical properties. In this regard, thermotropic liquid crystals have taken up an important role in technical applications. Because their mesomorphic and physical properties vary with the structural moieties and their combinations, the methods of synthesis affect the physical properties and consequently the uses of liquid crystals in various applications. Considering that a minimal difference in the structure of the compounds is enough to change the physical properties, a wide range of techniques to identify and characterise the liquid crystalline phases are required. Molecular simulations help to develop new products as well and accelerate liquid crystal research by theoretical characterization of mesogens and understanding the mesophase behaviour. As the physical identification techniques become more advanced, new, more ordered mesophases are going to be discovered, and new applications will be developed as a result.

This Special Issue of Crystals is addressed to all research scientists including experimental chemists, physicist, and physical chemists, encouraging them to report their results and findings in the synthesis of liquid crystal systems, especially with ferro- or antiferroelectric properties, physical characterisation techniques, structure–property relationships correlated with computational theory and their potential applications in opto-electronic devices.

Dr. Irina Cârlescu
Prof. Dr. Vladimir Chigrinov
Guest Editors

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Keywords

  • synthesis
  • ferroelectrics
  • antiferroelectrics
  • structure-property relationship
  • investigation techniques
  • applications
  • computational modelling

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Published Papers (1 paper)

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Research

15 pages, 3607 KB  
Article
Photo-Responsive Brominated Hydrogen-Bonded Liquid Crystals
by Christian Anders, Tejal Nirgude, Ahmed F. Darweesh and Mohamed Alaasar
Crystals 2025, 15(10), 886; https://doi.org/10.3390/cryst15100886 - 14 Oct 2025
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Abstract
This study reports on the preparation and comprehensive characterisation of new brominated hydrogen-bonded liquid crystalline (HBLC) materials. Two distinct series of supramolecular complexes were prepared by hydrogen-bond formation between 3-bromo-4-pentyloxybenzoic acid as the proton donor and non-fluorinated and fluorinated azopyridines with variable terminal [...] Read more.
This study reports on the preparation and comprehensive characterisation of new brominated hydrogen-bonded liquid crystalline (HBLC) materials. Two distinct series of supramolecular complexes were prepared by hydrogen-bond formation between 3-bromo-4-pentyloxybenzoic acid as the proton donor and non-fluorinated and fluorinated azopyridines with variable terminal chains as proton acceptors. The successful formation of a hydrogen bond was confirmed by FTIR spectroscopy. The impact of alkyl chain length and fluorination on the mesomorphic properties of the HBLCs was systematically investigated. The molecular self-assembly was thoroughly examined using polarised optical microscopy (POM) and differential scanning calorimetry (DSC), revealing the presence of smectic C (SmC), smectic A (SmA), and nematic (N) phases, with thermal stability being highly dependent on the molecular architecture. Notably, the introduction of fluorine atoms significantly influenced the phase transition temperatures and the overall mesophase range. Using bromine as a lateral substituent induces the formation of SmC phases in these HBLCs, a feature absent in their non-brominated analogues. Further structural insights were obtained through X-ray diffraction (XRD) investigations, confirming the nature of the observed LC phases. Additionally, the photo-responsive characteristics of these HBLCs were explored via UV-Vis spectroscopy, demonstrating their ability to undergo reversible photoisomerisation upon light irradiation. These findings underscore the critical role of precise molecular design in tailoring the properties of HBLCs for potential applications such as optical storage devices. Full article
(This article belongs to the Special Issue Thermotropic Liquid Crystals as Novel Functional Materials)
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