Isolation and Photophysical Properties of Di- and Tri-substituted Natural Anthraquinones from Malaysian Morinda citrifolia

Adnan, Nabila Elyana and Mohd Nasuha, Nur Atiqah and Abdullah, Zanariah and Choo, Yeun Mun and Tajuddin, Hairul Anuar (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

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Official URL: https://doi.org/10.17576/jsm-2018-4705-05

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
Uncontrolled Keywords: Absorption spectral; anthraquinone; emission spectral; intramolecular hydrogen bonding; photophysical properties
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science > Dept of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 08 Oct 2019 02:43
Last Modified: 08 Oct 2019 02:43
URI: http://eprints.um.edu.my/id/eprint/22697

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