Abstract
This study presents 13 new organic compounds with self-assembling behavior, which can be divided into two groups. The first synthesized group includes compounds based on 4′-(trifluoromethoxy)-[1,1′-biphenyl]-4-yl-4-(trifluoromethoxy) benzoate core, and the second includes compounds based on 4-((4-(trifluoromethoxy)phenyl)ethynyl)phenyl-4-(trifluoromethoxy) benzoate core. They differ in the number and location of the fluorine atom in the lateral position. Mesomorphic properties, phase transition enthalpies, refractive indices, birefringence, and MWIR (mid-wavelength infrared) spectral properties of the compounds were investigated, and the results were compared with currently used materials. The influence of the length of the core as well as type and position of substituents in the molecular core was analyzed. The lack of aliphatic protons in the molecular structure generated unique infrared properties.
Highlights
New-Generation Liquid CrystalThe first thought that comes to mind at the mention of liquid crystals is the display industry [1,2,3,4], which has given them the greatest fame and recognition
liquid crystals (LC) are used in devices operating in visible light, infrared (IR) [5], millimeter wave [6,7,8,9,10], terahertz [11,12,13,14], and gigahertz [15,16,17,18]
It is worth noting that liquid crystals have already been used in the MWIR range in Lyot filters [27], photonic crystal fibers [28,29], light shutters [30,31,32], adaptive optics [33], laser beam steering [34,35,36], and optical valves [37,38,39]
Summary
The first thought that comes to mind at the mention of liquid crystals is the display industry [1,2,3,4], which has given them the greatest fame and recognition. It is necessary to use larger bulky substituents, such as short alkyl chains in the form of methyl CH3 or ethyl C2 H5 groups, to achieve the required properties Molecules designed in this way can be used in all the aforementioned electromagnetic radiation ranges, excluding infrared, in particular the MWIR range. As part of our previous work [57,58,59], we developed a new molecular design approach that allowed us to obtain a next-generation self-assembling material primarily for use in the infrared range, and in the MWIR range [60,61,62,63] This approach involved shifting parasitic absorption bands toward longer wavelengths. This study proposes a compound with a completely different structure that is rich in π-electrons, provides much higher birefringence, and meets the criteria for setting future waveguiding devices
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