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

Tiong, Mee Hing (2014) Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation. Masters thesis, Universiti Malaysia Sarawak, (UNIMAS).

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Abstract

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.

Item Type: Thesis (Masters)
Additional Information: Thesis (M.Sc.) -- Universiti Malaysia Sarawak, 2014.
Uncontrolled Keywords: bis-chalcone, Organic Compounds, unimas, university, universiti, Borneo, Malaysia, Sarawak, Kuching, Samarahan, ipta, education,undergraduate, postgraduate, research, Universiti Malaysia Sarawak
Subjects: Q Science > QD Chemistry
Divisions: Academic Faculties, Institutes and Centres > Faculty of Resource Science and Technology
Depositing User: Karen Kornalius
Date Deposited: 20 Jul 2015 07:59
Last Modified: 04 Jun 2020 07:08
URI: http://ir.unimas.my/id/eprint/8355

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