Mohammed Mezher Aftan, Abdualwahid Abdualsatar Talloh, Adil Hussein Dalaf, Hanaa Kaain Salih
الملخص الانجليزي
A series of new mesogenic ester compounds were successfully synthesized. Azo compounds were prepared by coupling diazonium salt (which prepared from phenyl diamine with 1:1HCl and NaNO2) with phenol, and the prepared compounds were reacted with substituted benzoic acid to give esterification. FT-IR and 1H-NMR spectrometers were used to confirm the structures of the prepared compounds the optical microscope polarization and DSC have been studied in the liquid crystal phases. It was observed that the thermal stability of the nematic phase increased with an increase in the polarity of the substituted groups at the para and meta position, as following (Cl>OCH3>NO2>CH3) also, the thermal stability of nematic phase was highest at meta substituted compared with para substituted. In addition to, the kinetic behavior of the prepared compounds showed the effect para position through p-CH3 and p-OCH3 due to the presence of resonance effect in addition inductive effect, so (σ+) was used instead of (σ px). The results of the kinetic study showed through a Rho (ρ) value a decrease in the electronic density and an increase in the growth of the positive charge in the reaction center, this means that the reaction is stabilized with the presence of donating groups.
تاريخ النشر
21/03/2021
الناشر
Second International Conference on Aspects of Materials Science and Engineering (ICAMSE 2021)
عادل حسين دلف | Adil Hussein Dalaf | 3415