Impact of Intermediate and Terminal Groups on the Thermal Stability of Bent-Core Liquid Crystals
A series of new mesogenic chalcone, azomethine and azo compounds were successfully synthesized. A chalcone was prepared via condensation of isophthaldehyde with a p-hydroxyacetophenone in a basic medium, Schiff bases was prepared by condensation isophthaldehyde with a p-hydroxyaniline in acidic med...
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Tikrit University
2018-04-01
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| Series: | Tikrit Journal of Pure Science |
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| Online Access: | https://tjpsj.org/index.php/tjps/article/view/484 |
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| author | Mohammed M. Aftan |
| author_facet | Mohammed M. Aftan |
| author_sort | Mohammed M. Aftan |
| collection | DOAJ |
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A series of new mesogenic chalcone, azomethine and azo compounds were successfully synthesized. A chalcone was prepared via condensation of isophthaldehyde with a p-hydroxyacetophenone in a basic medium, Schiff bases was prepared by condensation isophthaldehyde with a p-hydroxyaniline in acidic medium. While azo compound was obtained by a reaction of m-diaminobenzen with NaNO2 and phenol, and the generated compound was reacted with alkyl bromide. The structures of such compounds were confirmed by FT-IR and 1H-NMR spectrometer. The liquid crystal phases were studied by Differential Scanning Calorimeter (DSC) and polarizing optical microscope with heating. A thermal stability of liquid crystal phases were increased by increasing the length of aliphatic chain to smectic phases and decreasing in the thermal stability of nematic phase. It has been observed that the thermal stability of liquid crystal in chalcone compounds were higher than others, azo and azomethine compound
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| format | Article |
| id | doaj-art-d931eb11a48b43d38d1722a23b164a46 |
| institution | Matheson Library |
| issn | 1813-1662 2415-1726 |
| language | English |
| publishDate | 2018-04-01 |
| publisher | Tikrit University |
| record_format | Article |
| series | Tikrit Journal of Pure Science |
| spelling | doaj-art-d931eb11a48b43d38d1722a23b164a462025-07-14T01:51:15ZengTikrit UniversityTikrit Journal of Pure Science1813-16622415-17262018-04-0123110.25130/tjps.v23i1.484Impact of Intermediate and Terminal Groups on the Thermal Stability of Bent-Core Liquid CrystalsMohammed M. Aftan A series of new mesogenic chalcone, azomethine and azo compounds were successfully synthesized. A chalcone was prepared via condensation of isophthaldehyde with a p-hydroxyacetophenone in a basic medium, Schiff bases was prepared by condensation isophthaldehyde with a p-hydroxyaniline in acidic medium. While azo compound was obtained by a reaction of m-diaminobenzen with NaNO2 and phenol, and the generated compound was reacted with alkyl bromide. The structures of such compounds were confirmed by FT-IR and 1H-NMR spectrometer. The liquid crystal phases were studied by Differential Scanning Calorimeter (DSC) and polarizing optical microscope with heating. A thermal stability of liquid crystal phases were increased by increasing the length of aliphatic chain to smectic phases and decreasing in the thermal stability of nematic phase. It has been observed that the thermal stability of liquid crystal in chalcone compounds were higher than others, azo and azomethine compound https://tjpsj.org/index.php/tjps/article/view/484bent-core liquid crystalthermal stabilitymesogensorder parameter |
| spellingShingle | Mohammed M. Aftan Impact of Intermediate and Terminal Groups on the Thermal Stability of Bent-Core Liquid Crystals Tikrit Journal of Pure Science bent-core liquid crystal thermal stability mesogens order parameter |
| title | Impact of Intermediate and Terminal Groups on the Thermal Stability of Bent-Core Liquid Crystals |
| title_full | Impact of Intermediate and Terminal Groups on the Thermal Stability of Bent-Core Liquid Crystals |
| title_fullStr | Impact of Intermediate and Terminal Groups on the Thermal Stability of Bent-Core Liquid Crystals |
| title_full_unstemmed | Impact of Intermediate and Terminal Groups on the Thermal Stability of Bent-Core Liquid Crystals |
| title_short | Impact of Intermediate and Terminal Groups on the Thermal Stability of Bent-Core Liquid Crystals |
| title_sort | impact of intermediate and terminal groups on the thermal stability of bent core liquid crystals |
| topic | bent-core liquid crystal thermal stability mesogens order parameter |
| url | https://tjpsj.org/index.php/tjps/article/view/484 |
| work_keys_str_mv | AT mohammedmaftan impactofintermediateandterminalgroupsonthethermalstabilityofbentcoreliquidcrystals |