Nabila Elyana Adnan, and Nur Atiqah Mohd Nasuha, and Zanariah Abdullah, and Choo, Yeun-Mun and Hairul Anuar Tajuddin, (2018) Isolation and photophysical properties of Di- and Tri-substituted natural anthraquinones from Malaysian Morinda citrifolia. Sains Malaysiana, 47 (5). pp. 903-908. ISSN 0126-6039
|
PDF
756kB |
Official URL: http://www.ukm.my/jsm/english_journals/vol47num5_2...
Abstract
Five di- and tri-substituted natural anthraquinones, i.e. nordamnacanthal (1), damnacanthal (2), rubiadin (3), 1-methoxy-2-methyl-3-hydroxyanthraquinone (4) and 1-hydroxy-3-methoxyanthraquinone (5) were subjected to photophysical studies. The results indicated that steric hindrance and intramolecular hydrogen bonding are important factors that affect absorption and emission spectral of these natural anthraquinones. Besides that, emission properties were significantly enhanced with formation of intramolecular hydrogen bonding in 1,3-dihydroxy-2-aldehyde tri-substituted anthraquinone 1. This gave rise to formation of two additional quasi aromatic rings extending the π-conjugation system in the anthraquinone structure.
| Item Type: | Article |
|---|---|
| Keywords: | Absorption spectral; Anthraquinone; Emission spectral; Intramolecular hydrogen bonding; Photophysical properties |
| Journal: | Sains Malaysiana |
| ID Code: | 12078 |
| Deposited By: | ms aida - |
| Deposited On: | 18 Sep 2018 07:51 |
| Last Modified: | 22 Sep 2018 10:30 |
Repository Staff Only: item control page
