Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties

Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties

In this research, a series of calamitic liquid crystal containing 1,2,4,5-tetrazine moieties have been synthesized. 1,2,4,5-tetrazine is a mesomorphic compound containing heterocyclic units and such structures have greater possibilities to obtain mesogenic molecules. All compounds were synthesized b...

Full description

Saved in:
Bibliographic Details
Main Author: Abdul Halim, Noor Hafizah
Format: Thesis
Language:English
English
Published: 2009
Subjects:
Liquid crystals - Case studies
Online Access:http://psasir.upm.edu.my/id/eprint/7546/1/ABS_---__FS_2009_28.pdf
Tags: Add Tag
No Tags, Be the first to tag this record!
id my-upm-ir.7546
record_format uketd_dc
spelling my-upm-ir.75462013-05-27T07:35:31Z Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties 2009 Abdul Halim, Noor Hafizah In this research, a series of calamitic liquid crystal containing 1,2,4,5-tetrazine moieties have been synthesized. 1,2,4,5-tetrazine is a mesomorphic compound containing heterocyclic units and such structures have greater possibilities to obtain mesogenic molecules. All compounds were synthesized by esterication of HOC6H4C2N4C6H4OH with carboxylic acids that vary in substituents chain lengths. The structures of the liquid crystal compounds were elucidated based on FT-IR, mass spectroscopy, CHN and NMR analyses. The infrared spectra of the compounds showed the characteristic of the tetrazine and ester functional group for νC=O, νC=C, νC=N, νN-N and νC-O at (1750-1758 cm-1), (1602-1604 cm-1), (1318-1396 cm-1), (1142-1168 cm-1) and (1016-1102 cm-1). The elemental analyses agree with the expected formula R-C6H4C2N4C6H4-R where R = C2H5 (FZ-4), C4H9(Isobutyl) (FZ-49E), C5H11 (FZ-37B), C11H23 (FZ-53), C15H31 (FZ-34A) and C17H35 (FZ-35A). The 1H NMR spectra reflected the high symmetry of the molecules with the benzene protons appeared as a doublet at δ(8.69–8.67ppm) and δ(7.36-7.34ppm), respectively. The 13C signals for the 1,2,4,5-tetrazine, C=O and C-O appeared at δ(163.30-163.25), δ(171.82-171.02ppm) and δ(154.48-154.40ppm), respectively. Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) analyses of FZ-37B, FZ-53, FZ-34A and FZ-35A revealed the existence of smectic and schlieren smectic mesophases. Liquid crystals - Case studies 2009 Thesis http://psasir.upm.edu.my/id/eprint/7546/ http://psasir.upm.edu.my/id/eprint/7546/1/ABS_---__FS_2009_28.pdf application/pdf en public masters Universiti Putra Malaysia Liquid crystals - Case studies Faculty of Science English
institution Universiti Putra Malaysia
collection PSAS Institutional Repository
language English
English
topic Liquid crystals - Case studies
spellingShingle Liquid crystals - Case studies


Abdul Halim, Noor Hafizah
Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties
description In this research, a series of calamitic liquid crystal containing 1,2,4,5-tetrazine moieties have been synthesized. 1,2,4,5-tetrazine is a mesomorphic compound containing heterocyclic units and such structures have greater possibilities to obtain mesogenic molecules. All compounds were synthesized by esterication of HOC6H4C2N4C6H4OH with carboxylic acids that vary in substituents chain lengths. The structures of the liquid crystal compounds were elucidated based on FT-IR, mass spectroscopy, CHN and NMR analyses. The infrared spectra of the compounds showed the characteristic of the tetrazine and ester functional group for νC=O, νC=C, νC=N, νN-N and νC-O at (1750-1758 cm-1), (1602-1604 cm-1), (1318-1396 cm-1), (1142-1168 cm-1) and (1016-1102 cm-1). The elemental analyses agree with the expected formula R-C6H4C2N4C6H4-R where R = C2H5 (FZ-4), C4H9(Isobutyl) (FZ-49E), C5H11 (FZ-37B), C11H23 (FZ-53), C15H31 (FZ-34A) and C17H35 (FZ-35A). The 1H NMR spectra reflected the high symmetry of the molecules with the benzene protons appeared as a doublet at δ(8.69–8.67ppm) and δ(7.36-7.34ppm), respectively. The 13C signals for the 1,2,4,5-tetrazine, C=O and C-O appeared at δ(163.30-163.25), δ(171.82-171.02ppm) and δ(154.48-154.40ppm), respectively. Differential scanning calorimetry (DSC) and polarizing optical microscopy (POM) analyses of FZ-37B, FZ-53, FZ-34A and FZ-35A revealed the existence of smectic and schlieren smectic mesophases.
format Thesis
qualification_level Master's degree
author Abdul Halim, Noor Hafizah
author_facet Abdul Halim, Noor Hafizah
author_sort Abdul Halim, Noor Hafizah
title Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties
title_short Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties
title_full Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties
title_fullStr Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties
title_full_unstemmed Mesogenic Properties of a Series of Synthesized Calamitic Liquid Crystals Containing 1,2,4,5-Tetrazine Moieties
title_sort mesogenic properties of a series of synthesized calamitic liquid crystals containing 1,2,4,5-tetrazine moieties
granting_institution Universiti Putra Malaysia
granting_department Faculty of Science
publishDate 2009
url http://psasir.upm.edu.my/id/eprint/7546/1/ABS_---__FS_2009_28.pdf
_version_ 1747810698148184064

Similar Items