Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain Lengths
Thermal and mesomorphic properties of possible 1:1 supramolecular complexes (SMCs) (<b>I<sub>m</sub>/I<sub>n</sub></b>) designed from two members of 4-[(4-(n-alkoxy)phenylimino)methyl]benzoic acid with symmetrical or un-symmetrical alkoxy terminal flexible chains...
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MDPI AG
2021-09-01
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| Series: | Symmetry |
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| Online Access: | https://www.mdpi.com/2073-8994/13/10/1785 |
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| author | Fowzia S. Alamro Hoda A. Ahmed Ayman M. Mostafa Magdi M. Naoum |
| author_facet | Fowzia S. Alamro Hoda A. Ahmed Ayman M. Mostafa Magdi M. Naoum |
| author_sort | Fowzia S. Alamro |
| collection | DOAJ |
| description | Thermal and mesomorphic properties of possible 1:1 supramolecular complexes (SMCs) (<b>I<sub>m</sub>/I<sub>n</sub></b>) designed from two members of 4-[(4-(n-alkoxy)phenylimino)methyl]benzoic acid with symmetrical or un-symmetrical alkoxy terminal flexible chains (carbons of m and n = 6, 8 and 16), were analyzed by differential scan-calorimetry (DSC), thermogravemetric (TG) analysis, and their mesophases identified by polarized optical microscopy (POM). The equimolecular mixtures of the two acids possess symmetrical and un-symmetrical terminal lengths. The mesomorphic properties of the binary mixtures were examined as a function of the total alkoxy chain length on both sides. Results revealed that the nematic mesophase temperature range increases as the total terminal length increases for all designed un-symmetrical mixtures. A comparison was constructed between the formed SMCs and of those of the previously prepared 4-n-alkoxyphenylazo benzoic acids as well as the 4-n-alkoxy benzoic acids, to examine the impact of mesogenic core on the mesomorphic properties. The comparison indicated that as the mesogenic portion lengthens the thermal mesophase stability exhibits higher values of phase transition temperatures; whereas, the azo and Schiff base moieties exhibited near thermal properties. |
| first_indexed | 2024-03-10T06:10:50Z |
| format | Article |
| id | doaj.art-d66dca9910d14c1d87adea8743b543fc |
| institution | Directory Open Access Journal |
| issn | 2073-8994 |
| language | English |
| last_indexed | 2024-03-10T06:10:50Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Symmetry |
| spelling | doaj.art-d66dca9910d14c1d87adea8743b543fc2023-11-22T20:09:04ZengMDPI AGSymmetry2073-89942021-09-011310178510.3390/sym13101785Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain LengthsFowzia S. Alamro0Hoda A. Ahmed1Ayman M. Mostafa2Magdi M. Naoum3Department of Chemistry, College of Science, Princess Nourah bint Abdulrahman University, Riyadh 11671, Saudi ArabiaDepartment of Chemistry, Faculty of Science, Cairo University, Cairo 12613, EgyptNational Research Centre, Spectroscopy Department, Physics Division, El-Buhouth St., Dokki, Giza 12622, EgyptDepartment of Chemistry, Faculty of Science, Cairo University, Cairo 12613, EgyptThermal and mesomorphic properties of possible 1:1 supramolecular complexes (SMCs) (<b>I<sub>m</sub>/I<sub>n</sub></b>) designed from two members of 4-[(4-(n-alkoxy)phenylimino)methyl]benzoic acid with symmetrical or un-symmetrical alkoxy terminal flexible chains (carbons of m and n = 6, 8 and 16), were analyzed by differential scan-calorimetry (DSC), thermogravemetric (TG) analysis, and their mesophases identified by polarized optical microscopy (POM). The equimolecular mixtures of the two acids possess symmetrical and un-symmetrical terminal lengths. The mesomorphic properties of the binary mixtures were examined as a function of the total alkoxy chain length on both sides. Results revealed that the nematic mesophase temperature range increases as the total terminal length increases for all designed un-symmetrical mixtures. A comparison was constructed between the formed SMCs and of those of the previously prepared 4-n-alkoxyphenylazo benzoic acids as well as the 4-n-alkoxy benzoic acids, to examine the impact of mesogenic core on the mesomorphic properties. The comparison indicated that as the mesogenic portion lengthens the thermal mesophase stability exhibits higher values of phase transition temperatures; whereas, the azo and Schiff base moieties exhibited near thermal properties.https://www.mdpi.com/2073-8994/13/10/1785symmetrical and un-symmetrical supramolecular-hydrogen bondingintermolecular interactions4-[(4-(n-alkoxy)phenylimino)methyl]benzoic acidthermal stabilityphase transitions |
| spellingShingle | Fowzia S. Alamro Hoda A. Ahmed Ayman M. Mostafa Magdi M. Naoum Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain Lengths Symmetry symmetrical and un-symmetrical supramolecular-hydrogen bonding intermolecular interactions 4-[(4-(n-alkoxy)phenylimino)methyl]benzoic acid thermal stability phase transitions |
| title | Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain Lengths |
| title_full | Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain Lengths |
| title_fullStr | Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain Lengths |
| title_full_unstemmed | Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain Lengths |
| title_short | Thermal and Mesomorphic Investigations of 1:1 Supramolecular Assemblies of 4-[(4-(n-Alkoxy)phenylimino)methyl]benzoic Acids Having Symmetrical and Un-Symmetrical Terminal Chain Lengths |
| title_sort | thermal and mesomorphic investigations of 1 1 supramolecular assemblies of 4 4 n alkoxy phenylimino methyl benzoic acids having symmetrical and un symmetrical terminal chain lengths |
| topic | symmetrical and un-symmetrical supramolecular-hydrogen bonding intermolecular interactions 4-[(4-(n-alkoxy)phenylimino)methyl]benzoic acid thermal stability phase transitions |
| url | https://www.mdpi.com/2073-8994/13/10/1785 |
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