Design and Synthesis of a Coumarin-based Acidichromic ColorantReport as inadecuate


Design and Synthesis of a Coumarin-based Acidichromic Colorant


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Department of Chemistry and Center for Nanoscience and Technology, Tunghai University, 181, Taichung-Kang Rd. Sec.3, Taichung, Taiwan 407





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Abstract This paper describes the fine-tuning of the acidichromic properties of a coumarin-containing colorant 1 by incorporation of electron-donating and electron-withdrawing substituents on the coumarin moiety. Colorant 1 can undergo two distinct and reversible color changes under both strongly acidic and basic conditions, but not in the presence of gaseous ammonia. The results indicated that the bromo-substituted compound 5b changes from red to yellow when exposed to gaseous ammonia, both in solution and on polycarbonate film, suggesting that an electron-withdrawing group at the 7-position of the coumarin moiety made the enolic hydrogen on 5b more susceptible to deprotonation by a base than in the unsubstituted compound 1. View Full-Text

Keywords: Coumarin; triketone; acidichromism; gas sensor; acid-base sensor Coumarin; triketone; acidichromism; gas sensor; acid-base sensor





Author: Shih-Lun Lin, Pei-Yu Kuo and Ding-Yah Yang *

Source: http://mdpi.com/



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