Title:	Induced mesomorphism in supramolecular structures of H-bonded binary mixtures containing fluoro and chloro substituted benzoic acids
Authors:	K, Sonali M Bhagavath, Poornima Srinivasulu, Maddasani Sinha, Rajeev K Swamynathan, K
Keywords:	H-bonded LCs Smectic A Fluoro/Chloro substituted acids Mesomorphism
Issue Date:	25-May-2022
Publisher:	Elsevier, Journal of Fluorine Chemistry
Citation:	Journal of Fluorine Chemistry, 2022, Vols. 259–260, p110002
Abstract:	In order to realize the mesomorphism through supramolecular structures, an attempt is made to synthesize new proton acceptors viz., (4-pyridyl)-benzylidene-4′ -n-octylaniline (PyB8A) which can form the hydrogen bond with the carboxylic acids. The non-mesogenic halo substituted aromatic carboxylic acids are used as proton donors. The aromatic carboxylic acids used are o-chlorobenzoic acid, m-chlorobenzoic acid, p-chlorobenzoic acid, o-fluorobenzoic acid, m-fluorobenzoic acid and p-fluorobenzoic acid. It is observed that the proton acceptor is involved in the formation of hydrogen bond with the aromatic carboxylic acids. The chemical characterization of the synthesized compounds is carried out by FTIR and 1H NMR spectroscopy techniques. The phase characterization is done by Polarizing Optical Microscope and the phase transition temperatures are obtained by Differential Scanning Calorimetry (DSC) (Shimadzu). X-ray powder diffraction (XRD) is carried out for phase confirmation and the structures of molecular complexes are optimized using density functional theory. It is noticed that the polarity, size and position (w.r.t. proton donor) of the substituent is playing an important role in stabilizing the mesomorphism. Longitudinal and transverse dipole moment (μl) of the molecules is influenced by the terminal and lateral substituents of the proton donors. Para chloro/fluoro-substituted H-bonded binary mixtures are exhibiting highest range of mesomorphism, while the lowest range is shown by meta substituted binary mixtures. The ortho substituted binary mixtures are intermediary of para and meta substituted binary mixtures. The mesomorphism is more appreciable in fluoro-substituted binary mixtures than the chloro-substituted mixtures.
Description:	Restricted Access
URI:	http://hdl.handle.net/2289/7962
ISSN:	0022-1139
Alternative Location:	https://doi.org/10.1016/j.jfluchem.2022.110002
Copyright:	2022 Elsevier
Appears in Collections:	Research Papers (SCM)

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