Abstract
New five rings architecture of 1:1 supramolecular hydrogen bonded (H-bonded) complexes were formed between 4-(2-(pyridin-4-yl)diazenyl-3-methylphenyl 4-alkoxybenzoates and 4-n-alkoxyphenyliminobenzoic acids. Mesomorphic and optical behaviors of three systems designed complexes were investigated by differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). H-bonded interactions were confirmed via FT-IR spectroscopy. Computational calculations were carried out by density functional theory (DFT) estimation for all formed complexes. Experimental evaluations were correlated with the theoretical predictions and results revealed that, all prepared complexes possessing enantiotropic tri-mesophases with induced smectic C (SmC) and nematic temperature ranges. Moreover, DFT predicted for all formed supramolecular complexes possessing a non-linear bent geometry. Moreover, the π–π stacking of the aromatic rings plays an important role in the mesomorphic properties and thermal stabilities of observed phases. The energy changes between frontier molecular orbitals (HOMO and LUMO) and the molecular electrostatic potential (MEP) of the designed complexes were discussed and related to the experimental results.
Highlights
Supramolecular approaches have a strong impact on various daily life device applications such as display devices, sensors, etc
The goal of the present study is to investigate experimentally and theoretically the thermal behavior resulting from intermolecular H-bonding interactions between the 4-alkoxyphenylimino behavior resulting from intermolecular H-bonding interactions between the 4-alkoxyphenylimino benzoic acids (An, Scheme 1) and the lateral methyl, 4-(2-(pyridin-4-yl)diazenyl-3-methylphenyl benzoic acids (An, Scheme 1) and the lateral methyl, 4-(2-(pyridin-4-yl)diazenyl-3-methylphenyl 44-alkoxybenzoates, (Im) [37]
Fourier Transform Infrared Spectroscopy (FT-IR): FT-IR spectra were recorded to prove the construction of the SMHBCs
Summary
Supramolecular approaches have a strong impact on various daily life device applications such as display devices, sensors, etc. These types of materials have an essential role in material science developments. The concept of Supramolecular liquid crystals has been successively applied for potential wide applications in scientific and technological fields [1,2,3,4,5]. Thermotropic hydrogen-bonded (H-bonded) liquid crystal complexes show great potential and are attracting interest [6,7,8,9,10,11,12,13,14,15].
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