Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials

Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials

The purpose of this research is to develop supramolecular organogel with liquid crystal (LC) mesophase and fluorescent properties for optical application as chemosensor of metal ions and colour tunable materials. The organogel was synthesised utilizing 1,3,5-triazine-2,4,6-tricarboxamide (TZTC12NH)...

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Main Author: Umar, Abdulhamid
Format: Thesis
Language:English
Published: 2019
Subjects:
QD Chemistry
Online Access:http://eprints.utm.my/id/eprint/102026/1/AbdulhamidUmarPFS2019.pdf
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spelling my-utm-ep.1020262023-07-31T07:07:38Z Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials 2019 Umar, Abdulhamid QD Chemistry The purpose of this research is to develop supramolecular organogel with liquid crystal (LC) mesophase and fluorescent properties for optical application as chemosensor of metal ions and colour tunable materials. The organogel was synthesised utilizing 1,3,5-triazine-2,4,6-tricarboxamide (TZTC12NH) as the self-assembly organic motif. In the first part of the research, TZTC12NH was synthesized in three steps to give a white powder solid in 52% yield. The compound was found to form columnar LC properties with mesophase range of 73.0 to 185.0oC and gave fluorescent emission maxima at 417 and 468 nm upon excitation at 254 nm. The compound was then utilized for the formation of an organogel at 10 wt. % of benzene which gave blue emission upon exposure to a wavelength excitation of 365 nm under a hand-held UV lamp. This organogel showed two emission bands centered at 417 and 468 nm with enhanced intensity when excited at 254 nm. Besides, the organogel shifted the columnar LC mesophase of TZTC12NH to 61.3 - 178.2oC. Polarized optical microscope imaging indicated that the organogel displayed a focal conic fan-like texture for typical arrangements of discotic hexagonal columnar LC. The organogel was utilized as chemosensor of metal ions via fluorescent quenching which showed selective response toward Cu2+ and Ag+ ions over other metal ions under consideration. The sensitivity based on linear Stern-Volmer plot Ksv value is 1.183 × 105 M with LOD 1.104 × 10-6 M for Cu2+ ions and Ksv 1.135 × 105 M with LOD 1.057 × 10-6 M for Ag+ ions, respectively. Upon doping the gel with Eu3+ ions at 0.01 M, the blue emission of the gel turned red under hand-held UV lamp and gave a new sharp emission band centered at 617 nm when excited at 250 nm due to the formation of metallogel. In addition, when few drops of methanoic acid were added to the gel, the red emission of the gel turned back to blue with disappearance of the emission band at 617 nm. Hence, this research showed the successful synthesis of new TZTC12NH as simple supramolecular self-assembly organic scaffold for development of organogel, chemosensor and colour tunable material. 2019 Thesis http://eprints.utm.my/id/eprint/102026/ http://eprints.utm.my/id/eprint/102026/1/AbdulhamidUmarPFS2019.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:146019 phd doctoral Universiti Teknologi Malaysia, Faculty of Science Faculty of Science
institution Universiti Teknologi Malaysia
collection UTM Institutional Repository
language English
topic QD Chemistry
spellingShingle QD Chemistry
Umar, Abdulhamid
Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials
description The purpose of this research is to develop supramolecular organogel with liquid crystal (LC) mesophase and fluorescent properties for optical application as chemosensor of metal ions and colour tunable materials. The organogel was synthesised utilizing 1,3,5-triazine-2,4,6-tricarboxamide (TZTC12NH) as the self-assembly organic motif. In the first part of the research, TZTC12NH was synthesized in three steps to give a white powder solid in 52% yield. The compound was found to form columnar LC properties with mesophase range of 73.0 to 185.0oC and gave fluorescent emission maxima at 417 and 468 nm upon excitation at 254 nm. The compound was then utilized for the formation of an organogel at 10 wt. % of benzene which gave blue emission upon exposure to a wavelength excitation of 365 nm under a hand-held UV lamp. This organogel showed two emission bands centered at 417 and 468 nm with enhanced intensity when excited at 254 nm. Besides, the organogel shifted the columnar LC mesophase of TZTC12NH to 61.3 - 178.2oC. Polarized optical microscope imaging indicated that the organogel displayed a focal conic fan-like texture for typical arrangements of discotic hexagonal columnar LC. The organogel was utilized as chemosensor of metal ions via fluorescent quenching which showed selective response toward Cu2+ and Ag+ ions over other metal ions under consideration. The sensitivity based on linear Stern-Volmer plot Ksv value is 1.183 × 105 M with LOD 1.104 × 10-6 M for Cu2+ ions and Ksv 1.135 × 105 M with LOD 1.057 × 10-6 M for Ag+ ions, respectively. Upon doping the gel with Eu3+ ions at 0.01 M, the blue emission of the gel turned red under hand-held UV lamp and gave a new sharp emission band centered at 617 nm when excited at 250 nm due to the formation of metallogel. In addition, when few drops of methanoic acid were added to the gel, the red emission of the gel turned back to blue with disappearance of the emission band at 617 nm. Hence, this research showed the successful synthesis of new TZTC12NH as simple supramolecular self-assembly organic scaffold for development of organogel, chemosensor and colour tunable material.
format Thesis
qualification_name Doctor of Philosophy (PhD.)
qualification_level Doctorate
author Umar, Abdulhamid
author_facet Umar, Abdulhamid
author_sort Umar, Abdulhamid
title Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials
title_short Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials
title_full Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials
title_fullStr Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials
title_full_unstemmed Supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials
title_sort supramolecular organogel with aggregation-induced emission and liquid crystal properties from 1,3,5-triazine 2,4,6-tricarboxamide for sensing metal ions and colour tunable materials
granting_institution Universiti Teknologi Malaysia, Faculty of Science
granting_department Faculty of Science
publishDate 2019
url http://eprints.utm.my/id/eprint/102026/1/AbdulhamidUmarPFS2019.pdf
_version_ 1776100828316172288

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