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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| Format: | Thesis |
| Language: | English |
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Universiti Malaysia Sarawak, (UNIMAS)
2014
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| Online Access: | http://ir.unimas.my/id/eprint/8355/ http://ir.unimas.my/id/eprint/8355/1/Tiong%20MH.pdf |
| _version_ | 1848836366081720320 |
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| author | Tiong, Mee Hing |
| author_facet | Tiong, Mee Hing |
| author_sort | Tiong, Mee Hing |
| building | UNIMAS Institutional Repository |
| collection | Online Access |
| 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. |
| first_indexed | 2025-11-15T06:22:37Z |
| format | Thesis |
| id | unimas-8355 |
| institution | Universiti Malaysia Sarawak |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T06:22:37Z |
| publishDate | 2014 |
| publisher | Universiti Malaysia Sarawak, (UNIMAS) |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | unimas-83552023-08-24T06:40:36Z http://ir.unimas.my/id/eprint/8355/ Structural modification on organic compounds containing α,β- conjugated keto-enol group and schiff base for the photophysical properties investigation 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 NonPeerReviewed text en http://ir.unimas.my/id/eprint/8355/1/Tiong%20MH.pdf 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). |
| 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 |
| title | 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_short | 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 |
| topic | QD Chemistry |
| url | http://ir.unimas.my/id/eprint/8355/ http://ir.unimas.my/id/eprint/8355/1/Tiong%20MH.pdf |