Mohammed Mezher Aftan, Mustafa Qutaiba Jabbar, Adil Hussein Dalaf, and Hanaa Kaain Salih
الملخص الانجليزي
A series of new Schiff’s base compounds have been successfully synthesized. The Schiff bases were prepared in an acidic medium by condensation p-diamino compounds with p-hydroxy benzaldehyde and the compound formed was reacted with alkyl bromide. At finally the oxazepine and 2-azetidinone compound were prepared for azo methyl group. FT-IR and 1H-NMR spectrometers have confirmed the structures of such compounds. The liquid crystalline properties were studied using (DSC) and polarizing optical microscope. By increasing the length of the aliphatic chain, the thermal stability of the smectic liquid crystal phases increased with a decrease in the thermal stability of the nematic phase, Also, increasing the number of aromatic rings from three to four rings led to an increase in the thermal stability of the liquid crystalline phases due to an increase in the electronic sequence at the center core. In addition to, the oxazepine compounds did not exhibit the liquid crystalline properties, whereas the 2-azetidinone compounds showed only the nematic phase. Also, the antibacterial activities against two different types of bacteria have been studied: 1) Escherichia coli Gram (-) ve. 2) Staphylococcus Gram (+) ve. Compared to the oxazepine and 2-azetidnone compounds and the Schiff bases prepared from them, it was observed that the increase in inhibition is directly proportional to the concentration. It was found that the highest inactivation was at concentration (100 ppm) and the lowest inhibition at concentration (10 ppm). In general, the oxazepine compounds gave a high inhibition compared with the azitidine compounds, as (A14) gave the highest inhibition of (3.65 mm) against (E. Coil) and (A13) compound the highest inhibition (3.45 mm) against (Staphylococcus), Also, the compounds inhibition of (E. coil) bacteria were higher than that of (staphylococcus), as the bacteria (Staphylococcus) showed high resistance.
تاريخ النشر
16/01/2021
الناشر
International Conference on Advanced Materials Behavior and Characterization (ICAMBC 2020)
عادل حسين دلف | Adil Hussein Dalaf | 4404