Abstract
The physical and chemical properties of three new liquid crystalline derivatives, based on an azomethine core with low-temperature mesophase—namely (4-methoxybenzylideneamino) phenyl palmitate (I), (4-methoxybenzylideneamino) phenyl oleate (II), and (4-methoxybenzylideneamino) phenyl linoleate (III)—were prepared and physically examined using experimental methodologies. Elemental analysis, FT-IR, and NMR spectroscopy were used to confirm their molecular structure. Differential scanning calorimetry (DSC) and polarized optical microscopy (POM) were used to investigate their mesomorphic activity. The results revealed that compound (I) is monotropic smectogenic, possessing the smectic A mesophase, whereas the other two analogues were shown to possess the SmA phase enantiotropically. Two of the saturated and unsaturated prepared derivatives (namely I and II) were used to construct their phase diagram. The eutectic composition of the mixture examined showed a slight enhancement of the stability of the smectic A phase. Polymorphic phases were produced at the eutectic composition of the binary phase diagram of the derivative II with the 4-n-dodecyloxy benzoic acid component.
Highlights
It is well known that the physical properties of organic materials are largely determined by their molecular structure
Of the mixture, which does not disrupt the arrangement of the molecules. Another example of a binary phase diagram was constructed for the present prepared fatty acid derivative II and the 4-n-dodecyloxy benzoic acid (D) in order to investigate the effect of different geometry of terminal chains on the mesomorphic properties of mixtures II/D
Three liquid crystalline derivatives, based on natural fatty acids, were prepared and their mesomorphic behavior examined by Differential scanning calorimetry (DSC) and polarized optical microscopy (POM)
Summary
It is well known that the physical properties of organic materials are largely determined by their molecular structure. The molecular structure of LC materials and, their of 8 mesomorphic properties are influenced by the terminal groups, which are either2small, compact polar groups or flexible, lengthy hydrocarbon chains [14]. Mesomorphic character throughout a large temperature range are desirable for practical Mixtures of liquid crystalline (LC) materials are attracting great attention these days [15–21]. Cused on the mesophase behavior when two or more compounds are mixed where none, Mesomorphic requirements of mesogenic cores are significantly changed when individone, all of the components are mesomorphic. A new two-ring calamitic (I–III, Figure 1), with an azomethine group as a central linkage, was synthesized and its mesomorphic and optical behavior examined, aiming to linkage, was synthesized and its mesomorphic and optical behavior examined, aiming to obtain low melting temperatures in the range of room temperature.
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