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...

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Main Author:	Tiong, Mee Hing
Format:	Thesis
Language:	English
Published:	2014
Subjects:	QD Chemistry
Online Access:	http://ir.unimas.my/id/eprint/8355/1/Tiong%20MH.pdf
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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

Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation

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