New nematogenic conical-shaped supramolecular H-bonded complexes for solar energy investigations

Abstract

New conical-shaped geometrical supramolecular H-bonded liquid crystal complexes were formed through 1:2 intermolecular interactions of H-bonding between flexible core (adipic acid, A) and lateral chloro-substituted azopyridines (Bn). The chains of the terminally alkoxy substituted base (n) were changed between 8 and 16 carbons. Mesomorphic and optical examinations of the prepared complexes were measured via differential scanning calorimetry (DSC) and polarizing optical microscopy (POM). Fourier-transform infrared spectroscopy (FT-IR) was used to confirm the Fermi bands of the H- bonding interactions. Induced nematogenic mesophases that cover the whole lengths of alkoxy-chains were detected. The non-linear geometries of the designed supramolecular complexes were also confirmed via Density functional theory (DFT) calculations. It was found that the length of terminal alkoxy chain of the base moiety highly affects the geometrical structure of the investigated complexes. Moreover, it increases the thermodynamic energy and influences the geometrical parameters. The electrical properties of each of the acid component (A), the base (B16) and their 1:2 complex (A/2B16) were evaluated using the Keithley measurement-source unit. The optical properties studies showed that the influences in the optical absorption and the reduction of the energy gap of the complex compared to its individual components made the resulted supramolecular H-bonded complex soft material suitable for solar energy investigations.

Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain Lengths

“…Supramolecular interactions resulted from H-bonded systems have wide attention in technological applications [1][2][3][4][5][6]. Liquid crystal (LC) materials have non-covalent interactions as well as potential applications for functional molecular shapes.…”

Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with Chlorine

“…The insertion of the lateral Cl atom in SMHBC structure weakens the side-by-side cohesion forces, thus increasing the predominance of the N phase formation for all 1:1 SMHBCs compared by our previous laterally neat SMHBCs [53], that briefly discussed in Section 3.3. Moreover, the molecular architecture and volume of the lateral moiety affect the mesophase thermal stability and the polarizability of whole molecule [35]. Further, the length of the terminal chain and the orientation of the lateral substituent are essential factors in determining the type and the temperature range of the produced mesophase.…”

“…The overall molecular architectures, as well as the combination of rigid (aromatic) and flexible segments (alkyl chains), produce anisotropic structures. These changes in LC features may have an impact on mesomorphism as well as the properties important for their technical applications [34][35][36][37].…”

Novel maleic anhydride derivatives: liquid crystalline materials with enhanced mesomorphic and optical characteristics

“…Each liquid crystal assembly that makes up a display pixel is governed by its own electromagnetic field. The field modifies the liquid crystals' orientation, which alters how much light can pass through them and result in the images you see on a screen (Alamro et al, 2021;Gomha et al, 2021;Abdou et al, 2022;Alamro et al, 2022;Chi et al, 2022;Uchida et al, 2022;Wang et al, 2022;Yin et al, 2022;Behera et al, 2023;Ma et al, 2023).…”