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Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals

Two homologues series of diimine and tetraimine compounds have been successfully prepared and characterized. Elemental analysis (CHN microanalysis), FT-IR, 1D, and 2D- NMR spectroscopic techniques were employed to elucidate the molecular structures of the synthesized compounds. The liquid crystal pr...

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Main Author: Salwadi, Nur Fatin Liyana
Format: Thesis
Language:English
Published: 2023
Subjects:
QD1-999 Chemistry
Online Access:http://eprints.usm.my/60197/1/24%20Pages%20from%20NUR%20FATIN%20LIYANA%20BINTI%20SALWADI.pdf
http://eprints.usm.my/60197/
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spelling my.usm.eprints.60197 http://eprints.usm.my/60197/ Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals Salwadi, Nur Fatin Liyana QD1-999 Chemistry Two homologues series of diimine and tetraimine compounds have been successfully prepared and characterized. Elemental analysis (CHN microanalysis), FT-IR, 1D, and 2D- NMR spectroscopic techniques were employed to elucidate the molecular structures of the synthesized compounds. The liquid crystal properties and thermal behavior of all compounds were conducted by using POM and DSC. The first series comprising of homologous V-shaped compounds (3a-3g) consist of a central phenyl core connected by two identical mesogenic units which possess the imine (C=N) and ester (COO) bonds along with the terminal alkoxy chain, (-OCnH2n+1) where n = 6-12. The shorter chain compounds (n = 6 and n = 8) were monotropic nematic phase, while the compounds with longer alkoxy chain (n = 10 and n = 12) exhibited enantiotropic nematic phase. However, compounds in the first series with the odd-membered terminal alkyl chain were found to be non-mesogenic in nature. The second series of benzidine-based oligomers possess four mesogenic arms (multi-arm liquid crystal). The symmetrical four rod like imine C=N containing units possess terminal alkoxy chains CnH2n+1 of which the n ranged from 6 to 12 (4a-4g). Upon heating the molecules containing n = 8-10 and n = 12 exhibited the endothermic peaks characteristic of the crystal-mesophase transition in addition to crystal-crystal subphases. 2023-07 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/60197/1/24%20Pages%20from%20NUR%20FATIN%20LIYANA%20BINTI%20SALWADI.pdf Salwadi, Nur Fatin Liyana (2023) Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals. Masters thesis, Perpustakaan Hamzah Sendut.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic QD1-999 Chemistry
spellingShingle QD1-999 Chemistry
Salwadi, Nur Fatin Liyana
Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals
description Two homologues series of diimine and tetraimine compounds have been successfully prepared and characterized. Elemental analysis (CHN microanalysis), FT-IR, 1D, and 2D- NMR spectroscopic techniques were employed to elucidate the molecular structures of the synthesized compounds. The liquid crystal properties and thermal behavior of all compounds were conducted by using POM and DSC. The first series comprising of homologous V-shaped compounds (3a-3g) consist of a central phenyl core connected by two identical mesogenic units which possess the imine (C=N) and ester (COO) bonds along with the terminal alkoxy chain, (-OCnH2n+1) where n = 6-12. The shorter chain compounds (n = 6 and n = 8) were monotropic nematic phase, while the compounds with longer alkoxy chain (n = 10 and n = 12) exhibited enantiotropic nematic phase. However, compounds in the first series with the odd-membered terminal alkyl chain were found to be non-mesogenic in nature. The second series of benzidine-based oligomers possess four mesogenic arms (multi-arm liquid crystal). The symmetrical four rod like imine C=N containing units possess terminal alkoxy chains CnH2n+1 of which the n ranged from 6 to 12 (4a-4g). Upon heating the molecules containing n = 8-10 and n = 12 exhibited the endothermic peaks characteristic of the crystal-mesophase transition in addition to crystal-crystal subphases.
format Thesis
author Salwadi, Nur Fatin Liyana
author_facet Salwadi, Nur Fatin Liyana
author_sort Salwadi, Nur Fatin Liyana
title Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals
title_short Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals
title_full Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals
title_fullStr Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals
title_full_unstemmed Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals
title_sort synthesis, characterization, optical, thermal behaviour and dft investigation of non-conventional liquid crystals
publishDate 2023
url http://eprints.usm.my/60197/1/24%20Pages%20from%20NUR%20FATIN%20LIYANA%20BINTI%20SALWADI.pdf
http://eprints.usm.my/60197/
_version_ 1794552257802403840
score 13.211869

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