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...

Full description

Saved in:

Bibliographic Details
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
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-usm-ep.60197
record_format	uketd_dc
spelling	my-usm-ep.601972024-03-15T01:02:40Z Synthesis, Characterization, Optical, Thermal Behaviour And Dft Investigation Of Non-Conventional Liquid Crystals 2023-07 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 http://eprints.usm.my/60197/ http://eprints.usm.my/60197/1/24%20Pages%20from%20NUR%20FATIN%20LIYANA%20BINTI%20SALWADI.pdf application/pdf en public masters Perpustakaan Hamzah Sendut Pusat Pengajian Sains Kimia
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
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
qualification_level	Master's degree
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
granting_institution	Perpustakaan Hamzah Sendut
granting_department	Pusat Pengajian Sains Kimia
publishDate	2023
url	http://eprints.usm.my/60197/1/24%20Pages%20from%20NUR%20FATIN%20LIYANA%20BINTI%20SALWADI.pdf
_version_	1794024104440889344

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

Similar Items