Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with Chlorine
New supramolecular complexes, based on H-bonding interactions between 4-(pyridin-4-yl) azo-(2-chlorophenyl) 4-alkoxybenzoates (<b>B</b><i>n</i>) and 4-[(4-(n-hexyloxy)phenylimino)methyl]benzoic acid (<b>A</b><i>6</i>), were prepared and their thermal a...
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MDPI AG
2021-12-01
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| Series: | Polymers |
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| Online Access: | https://www.mdpi.com/2073-4360/13/24/4292 |
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| author | Fowzia S. Alamro Omaima A. Alhaddad Magdi M. Naoum Hoda A. Ahmed |
| author_facet | Fowzia S. Alamro Omaima A. Alhaddad Magdi M. Naoum Hoda A. Ahmed |
| author_sort | Fowzia S. Alamro |
| collection | DOAJ |
| description | New supramolecular complexes, based on H-bonding interactions between 4-(pyridin-4-yl) azo-(2-chlorophenyl) 4-alkoxybenzoates (<b>B</b><i>n</i>) and 4-[(4-(n-hexyloxy)phenylimino)methyl]benzoic acid (<b>A</b><i>6</i>), were prepared and their thermal and mesomorphic properties investigated via differential scanning calorimetry (DSC) and Fourier-transform infrared spectroscopy (FT-IR) in order to confirm their H-bonding interactions. The mesophase behavior of each mixture was examined by DSC and polarized optical microscopy (POM). According to the findings of the study, in all of the designed mixtures, the introduction of laterally polar chlorine atom to the supramolecular complexes produces polymorphic compounds possessing smectic A, smectic C and nematic mesophases, in addition, all products have low melting transitions. Thermal stabilities of the associated phases depend on the position and orientation of the lateral polar Cl<sup>−</sup> atom as well as the length of terminal flexible alkoxy chain. Comparisons were made between the present lateral Cl<sup>−</sup> complexes and previously investigated laterally-neat complexes in order to investigate the impact of the addition, nature and orientation of polar substituent on the mesomorphic behavior. The investigations revealed that, the polarity and mesomeric nature of inserted lateral substituent into the base component play an essential role in affecting their mesomorphic properties. Furthermore, for current complexes, induced polymorphic phases have been found by introducing the chlorine atom. |
| first_indexed | 2024-03-10T03:15:52Z |
| format | Article |
| id | doaj.art-b89718ecb0a8410da2c12ae75dde35e6 |
| institution | Directory Open Access Journal |
| issn | 2073-4360 |
| language | English |
| last_indexed | 2024-03-10T03:15:52Z |
| publishDate | 2021-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Polymers |
| spelling | doaj.art-b89718ecb0a8410da2c12ae75dde35e62023-11-23T10:14:15ZengMDPI AGPolymers2073-43602021-12-011324429210.3390/polym13244292Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with ChlorineFowzia S. Alamro0Omaima A. Alhaddad1Magdi M. Naoum2Hoda A. Ahmed3Department of Chemistry, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh 11671, Saudi ArabiaChemistry Department, College of Sciences, Taibah University, Madina Monawara 30002, Saudi ArabiaDepartment of Chemistry, Faculty of Science, Cairo University, Cairo 12613, EgyptDepartment of Chemistry, Faculty of Science, Cairo University, Cairo 12613, EgyptNew supramolecular complexes, based on H-bonding interactions between 4-(pyridin-4-yl) azo-(2-chlorophenyl) 4-alkoxybenzoates (<b>B</b><i>n</i>) and 4-[(4-(n-hexyloxy)phenylimino)methyl]benzoic acid (<b>A</b><i>6</i>), were prepared and their thermal and mesomorphic properties investigated via differential scanning calorimetry (DSC) and Fourier-transform infrared spectroscopy (FT-IR) in order to confirm their H-bonding interactions. The mesophase behavior of each mixture was examined by DSC and polarized optical microscopy (POM). According to the findings of the study, in all of the designed mixtures, the introduction of laterally polar chlorine atom to the supramolecular complexes produces polymorphic compounds possessing smectic A, smectic C and nematic mesophases, in addition, all products have low melting transitions. Thermal stabilities of the associated phases depend on the position and orientation of the lateral polar Cl<sup>−</sup> atom as well as the length of terminal flexible alkoxy chain. Comparisons were made between the present lateral Cl<sup>−</sup> complexes and previously investigated laterally-neat complexes in order to investigate the impact of the addition, nature and orientation of polar substituent on the mesomorphic behavior. The investigations revealed that, the polarity and mesomeric nature of inserted lateral substituent into the base component play an essential role in affecting their mesomorphic properties. Furthermore, for current complexes, induced polymorphic phases have been found by introducing the chlorine atom.https://www.mdpi.com/2073-4360/13/24/4292polymorphic phaseslateral chlorosupramolecular dimershydrogen bondinginduced phasemesomorphic properties |
| spellingShingle | Fowzia S. Alamro Omaima A. Alhaddad Magdi M. Naoum Hoda A. Ahmed Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with Chlorine Polymers polymorphic phases lateral chloro supramolecular dimers hydrogen bonding induced phase mesomorphic properties |
| title | Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with Chlorine |
| title_full | Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with Chlorine |
| title_fullStr | Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with Chlorine |
| title_full_unstemmed | Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with Chlorine |
| title_short | Polymorphic Phases of Supramolecular Liquid Crystal Complexes Laterally Substituted with Chlorine |
| title_sort | polymorphic phases of supramolecular liquid crystal complexes laterally substituted with chlorine |
| topic | polymorphic phases lateral chloro supramolecular dimers hydrogen bonding induced phase mesomorphic properties |
| url | https://www.mdpi.com/2073-4360/13/24/4292 |
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