Abstract
New supramolecular complexes, based on H-bonding interactions between 4-(pyridin-4-yl) azo-(2-chlorophenyl) 4-alkoxybenzoates (Bn) and 4-[(4-(n-hexyloxy)phenylimino)methyl]benzoic acid (A6), were prepared and their thermal and mesomorphic properties investigated via differential scanning calorimetry (DSC) and Fourier-transform infrared spectroscopy (FT-IR) in order to confirm their H-bonding interactions. The mesophase behavior of each mixture was examined by DSC and polarized optical microscopy (POM). According to the findings of the study, in all of the designed mixtures, the introduction of laterally polar chlorine atom to the supramolecular complexes produces polymorphic compounds possessing smectic A, smectic C and nematic mesophases, in addition, all products have low melting transitions. Thermal stabilities of the associated phases depend on the position and orientation of the lateral polar Cl− atom as well as the length of terminal flexible alkoxy chain. Comparisons were made between the present lateral Cl− complexes and previously investigated laterally-neat complexes in order to investigate the impact of the addition, nature and orientation of polar substituent on the mesomorphic behavior. The investigations revealed that, the polarity and mesomeric nature of inserted lateral substituent into the base component play an essential role in affecting their mesomorphic properties. Furthermore, for current complexes, induced polymorphic phases have been found by introducing the chlorine atom.
Highlights
Supramolecular hydrogen bonded complexes (SMHBCs) have recently attracted an increasing amount of scientific attention [1–5]
Modifying the core structure of azo-pyridine based derivatives or adding lateral substituents might result in significant changes in their ecule to make them photo-responsive [6,7]
Modifying the core structure of azo-pyridine based derivatives or adding lateral substituents might result in significant chang2eosf 1i2n their photo-physical and photochemical capabilities [6,7]
Summary
Supramolecular hydrogen bonded complexes (SMHBCs) have recently attracted an increasing amount of scientific attention [1–5]. The use of multifunctional components in the development of non-covalent interactions can result in improved characteristics of SMHB LC network architectures [6,7] Because of their abilities to cis/trans isomerization, as a result of temperature and light irradiation, azo-pyridine molecules are incorporated within the liquid-crystal molecule to make them photo-responsive [6,7]. Modifying the core structure of azo-pyridine based derivatives or adding lateral substituents might result in significant changes in their ecule to make them photo-responsive [6,7]. Modifying the core structure of azo-pyridine based derivatives or adding lateral substituents might result in significant chang2eosf 1i2n their photo-physical and photochemical capabilities [6,7].
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