Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups
A series of new mesogenic azomethine diols were successfully synthesized by condensation reactions between various chloroalkanols and N,N'-bis(4-hydroxy)-benzylidene-o-toluidine (1). The structures of these compounds were confirmed by CHN, FT-IR, 1H-NMR, and 13C-NMR spectrophotometer. Their the...
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| Format: | Article |
| Language: | English |
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MDPI AG
2010-04-01
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| Series: | Molecules |
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| Online Access: | http://www.mdpi.com/1420-3049/15/5/3260/ |
| _version_ | 1819033762292301824 |
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| author | Issam Ahmed Mohammed Govindarajan Sankar Melati Khairuddean Abu Bakar Mohamad |
| author_facet | Issam Ahmed Mohammed Govindarajan Sankar Melati Khairuddean Abu Bakar Mohamad |
| author_sort | Issam Ahmed Mohammed |
| collection | DOAJ |
| description | A series of new mesogenic azomethine diols were successfully synthesized by condensation reactions between various chloroalkanols and N,N'-bis(4-hydroxy)-benzylidene-o-toluidine (1). The structures of these compounds were confirmed by CHN, FT-IR, 1H-NMR, and 13C-NMR spectrophotometer. Their thermotropic liquid crystalline behavior was studied using differential scanning calorimetry (DSC) and polarizing optical microscope (POM). 4,4'-di(4-Hydroxybutoxy)-N-benzylidine-o-tolidine (2a) does not exhibit liquid crystalline properties. A nematic texture was observed for mesogenic diols 2b, and 2d, whereas the diol 2c exhibits a smectic mesophase. The increase of terminal alkyl chain in these mesogenic diols leads to a decrease in the transition temperature. |
| first_indexed | 2024-12-21T07:22:59Z |
| format | Article |
| id | doaj.art-60b6bc6003f74a4f985a92d7e7e9b34d |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-12-21T07:22:59Z |
| publishDate | 2010-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-60b6bc6003f74a4f985a92d7e7e9b34d2022-12-21T19:11:45ZengMDPI AGMolecules1420-30492010-04-011553260326910.3390/molecules15053260Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine GroupsIssam Ahmed MohammedGovindarajan SankarMelati KhairuddeanAbu Bakar MohamadA series of new mesogenic azomethine diols were successfully synthesized by condensation reactions between various chloroalkanols and N,N'-bis(4-hydroxy)-benzylidene-o-toluidine (1). The structures of these compounds were confirmed by CHN, FT-IR, 1H-NMR, and 13C-NMR spectrophotometer. Their thermotropic liquid crystalline behavior was studied using differential scanning calorimetry (DSC) and polarizing optical microscope (POM). 4,4'-di(4-Hydroxybutoxy)-N-benzylidine-o-tolidine (2a) does not exhibit liquid crystalline properties. A nematic texture was observed for mesogenic diols 2b, and 2d, whereas the diol 2c exhibits a smectic mesophase. The increase of terminal alkyl chain in these mesogenic diols leads to a decrease in the transition temperature.http://www.mdpi.com/1420-3049/15/5/3260/thermotropic liquid crystalnematic phasediolsazomethine |
| spellingShingle | Issam Ahmed Mohammed Govindarajan Sankar Melati Khairuddean Abu Bakar Mohamad Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups Molecules thermotropic liquid crystal nematic phase diols azomethine |
| title | Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups |
| title_full | Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups |
| title_fullStr | Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups |
| title_full_unstemmed | Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups |
| title_short | Synthesis and Liquid Crystalline Properties of New Diols Containing Azomethine Groups |
| title_sort | synthesis and liquid crystalline properties of new diols containing azomethine groups |
| topic | thermotropic liquid crystal nematic phase diols azomethine |
| url | http://www.mdpi.com/1420-3049/15/5/3260/ |
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