Abstract
Experimental and geometrical approaches of new systems of mesomorphic 1:1 supramolecular H-bonded complexes (SMHBCs) of five rings are discussed. The H-bonding between 4-alkoxyphenylimino benzoic acids (An, as proton acceptor) and 4-(4′–pyridylazophenyl) 4′′-alkoxybenzoates (Bm, as proton donor) were investigated. Mesomorphic behaviors were analyzed by differential scanning calorimetry (DSC) and mesophase textures were identified by polarized light microscopy (POM). H-bonded assembly was established by FT-IR spectroscopic measurements via Fermi band discussion. Thermal and theoretical factors were predicted for all synthesized complexes by density functional theory (DFT) predictions. The results revealed that all prepared complexes were monomorphic, with a broad range of smectic A phases with a high thermal stability of enantiotropic mesophase. Furthermore, DFT stimulations illustrated the experimental results in terms of the influence of the chain length either of the acid or the base component. Many parameters, such as the calculated stability, the dipole moment and the polarizability of the H-bonded complexes, illustrate how these parameters work together to enhance the smectic mesophases with the obtained stability and range.
Highlights
Supramolecular hydrogen-bonding liquid crystal complexes (SMHBLCs) were first made in the20th century [1]
The first reported SMHBLC dimers were made between 4-n-alkoxycinnamic acids and
A huge number of liquid crystalline materials have been investigated using different synthetic methods, the design of SMHBLCs through intermolecular interactions between complementary components are of great interest
Summary
Supramolecular hydrogen-bonding liquid crystal complexes (SMHBLCs) were first made in the20th century [1]. Supramolecular hydrogen-bonding liquid crystal complexes (SMHBLCs) were first made in the. A huge number of liquid crystalline materials have been investigated using different synthetic methods, the design of SMHBLCs through intermolecular interactions between complementary components are of great interest. The types of interactions might be H-bonding [5,6,7] or halogen bonding [8,9,10,11,12,13] and both have the advantage of easy accessibility compared to covalently bonding liquid crystals. Thermotropic LCs based on intermolecular hydrogen bond interactions are mostly used in display devices and sensor applications [14,15,16,17,18]. Molecular geometry in LC H-bonded complexes can be assembled between different conformations depending on the investigated hydrogen bond donors and acceptors. Several SMHBLCs were formed using different types of H-donors and Crystals 2020, 10, 795; doi:10.3390/cryst10090795 www.mdpi.com/journal/crystals
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