Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation
This study consists of three parts, which are (i) the synthesis of bis-chalcone and their photophysical properties studies; (ii) the synthesis of α,β-conjugated Schiff base and spectroscopic characterization; (iii) the complexation reaction on both bis-chalcone and α,β-conjugated Schiff base. The re...
Saved in:
Main Author: | |
---|---|
Format: | Thesis |
Language: | English |
Published: |
2014
|
Subjects: | |
Online Access: | http://ir.unimas.my/id/eprint/8355/1/Tiong%20MH.pdf |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
id |
my-unimas-ir.8355 |
---|---|
record_format |
uketd_dc |
spelling |
my-unimas-ir.83552023-08-24T06:40:36Z Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation 2014 Tiong, Mee Hing QD Chemistry This study consists of three parts, which are (i) the synthesis of bis-chalcone and their photophysical properties studies; (ii) the synthesis of α,β-conjugated Schiff base and spectroscopic characterization; (iii) the complexation reaction on both bis-chalcone and α,β-conjugated Schiff base. The result from fundamental photophysical measurements of bis-chalcone compounds showed that the λmax of emission shifted to lower energy after having the OCH3 group at the center phenyl ring. Bis-chalcone 2a showed solvatochromism behavior and the emission wavelength increased from 499 nm (benzene) to 523 nm (MeCN). The presence of electron donating or withdrawing group as substituent in α,β-conjugated Schiff base can give an electronic effect on C=N moiety. The electron donating group caused shielding effect to the proton at C=N group, which resulted in upfield proton, whereas, the electron withdrawing group, a downfield proton of C=N was observed. The C=O and C=N bonds in bis-chalcone and α,β-conjugated Schiff base respectively have significantly shifted either to a lower or higher frequency after forming a complex in their IR spectra. For both type of complexes, a π bonding from metal centre to the Cα=Cβ bond was observed in the IR and NMR spectra. Universiti Malaysia Sarawak, (UNIMAS) 2014 Thesis http://ir.unimas.my/id/eprint/8355/ http://ir.unimas.my/id/eprint/8355/1/Tiong%20MH.pdf text en validuser masters Universiti Malaysia Sarawak, (UNIMAS) Faculty of Resource Science and Technology. |
institution |
Universiti Malaysia Sarawak |
collection |
UNIMAS Institutional Repository |
language |
English |
topic |
QD Chemistry |
spellingShingle |
QD Chemistry Tiong, Mee Hing Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation |
description |
This study consists of three parts, which are (i) the synthesis of bis-chalcone and their photophysical properties studies; (ii) the synthesis of α,β-conjugated Schiff base and spectroscopic characterization; (iii) the complexation reaction on both bis-chalcone and α,β-conjugated Schiff base. The result from fundamental photophysical measurements of bis-chalcone compounds showed that the λmax of emission shifted to lower energy after having the OCH3 group at the center phenyl ring. Bis-chalcone 2a showed solvatochromism behavior and the emission wavelength increased from 499 nm (benzene) to 523 nm (MeCN). The presence of electron donating or withdrawing group as substituent in α,β-conjugated Schiff base can give an electronic effect on C=N moiety. The electron donating group caused shielding effect to the proton at C=N group, which resulted in upfield proton, whereas, the electron withdrawing group, a downfield proton of C=N was observed. The C=O and C=N bonds in bis-chalcone and α,β-conjugated Schiff base respectively have significantly shifted either to a lower or higher frequency
after forming a complex in their IR spectra. For both type of complexes, a π bonding from metal centre to the Cα=Cβ bond was observed in the IR and NMR spectra. |
format |
Thesis |
qualification_level |
Master's degree |
author |
Tiong, Mee Hing |
author_facet |
Tiong, Mee Hing |
author_sort |
Tiong, Mee Hing |
title |
Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation |
title_short |
Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation |
title_full |
Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation |
title_fullStr |
Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation |
title_full_unstemmed |
Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation |
title_sort |
structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation |
granting_institution |
Universiti Malaysia Sarawak, (UNIMAS) |
granting_department |
Faculty of Resource Science and Technology. |
publishDate |
2014 |
url |
http://ir.unimas.my/id/eprint/8355/1/Tiong%20MH.pdf |
_version_ |
1783727987638665216 |