Synthesis of liquid crystals based on hydrogen-bonding of 4-(Octyloxy)benzoic acid with 4-alkylbenzoic acids |
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| Authors: | M D Miranda F Vaca Chávez TMR Maria M E S Eusébio PJ Sebastião P Martín-Ramos |
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| Institution: | 1. European Space Agency, Noordwijk, The Netherlands;2. CFisUC, Department of Physics, University of Coimbra, Coimbra, Portugal;3. Centre of Physics and Engineering of Advanced Materials, Physics Department, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal;4. CQC, Chemistry Department, University of Coimbra, Coimbra, Portugal;5. CFisUC, Department of Physics, University of Coimbra, Coimbra, Portugal |
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| Abstract: | A molecular recognition process has been used to form new mesogenic molecular structures, where intermolecular hydrogen bonding occurs between 4-(octyloxy)benzoic acid (8BAO) and four 4-alkylbenzoic acids (nBAs, n = 2, 5, 6, 7). The synthesis of these complexes has been attained by resorting to mechanochemistry. The resulting materials have been characterized by polarizing optical thermal microscopy, differential scanning calorimetry, vibrational spectroscopy, X-ray powder diffraction, and 1H NMR relaxometry. All the elements of the series show the formation of a mesophase. For one of the complexes, its electro-optical properties have also been assessed, resulting comparable to those of other widely used liquid crystals. |
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| Keywords: | 4-Alkylbenzoic acids hydrogen bonding liquid crystals mechanochemistry 4-(octyloxy)benzoic acid |
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