Synthesis of selected pyrazine derivatives and their photopyhsical characteristics

Abdullah, Z. and Johari, H.N. and Idris, A. (2018) Synthesis of selected pyrazine derivatives and their photopyhsical characteristics. In: 5th International Conference on Organic and Inorganic Chemistry 2018, 12-13 July 2018, Paris, France.

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Abstract

2-Phenoxypyrazine, 2-o-methyphenoxypyrazine, 2-m-methylphenoxypyrazine, and 2-p-methylphenoxypyrazine were obtained when 2-chloropyrazine was treated with phenol, o-cresol, m-cresol and p-cresol respectively. Reactions of 2-choropyrazine-5-carboxylic acid methyl ester with phenol, 3-methylphenol and 3-nitrophenol gave 5-phenoxypyrazine- 2-carboxylic acid, 5-m-tolyoxyprazine-2-carboxyclic acid methyl ester and 5-(-3-nitrophenoxy) pyrazine-2-carboxyliic acid methyl ester respectively. 2.5-Dimethyl-3-phenoxypyrazine was obtained when phenol was reacted with 3-chloro- 2,5-dimethylpyrazine. Naphthalenyloxy derivatives were obtained when 2- chloropyrazine reacted with 1 and 2- naphtol respectively. The structures of newly synthesized compounds were spectroscopically characterized. Fluorescence studies showed that compounds 2, 4 and 8 quenched in the presence of oxygen. Compounds 1 and 7 showed the highest fluorescence intensity in alkaline condition. Compound 1, 4 and 8 exhibit the highest emission wavelength in non-polar solvents and falls drastically in polar aprotic solvents. Highest fluorescence intensity was recorded with compounds which have electron donating substituents and has rigid structure.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Conference paper
Uncontrolled Keywords: Pyrazine; Photopyhsical; Alkaline condition; Phenol
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Faculty of Science
Depositing User: Mr. Mohd Safri
Date Deposited: 17 Aug 2018 04:33
Last Modified: 17 Aug 2018 04:33
URI: http://eprints.um.edu.my/id/eprint/19002

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