Design and Synthesis of a Coumarin-based Acidichromic Colorant

Molecules

Shih-Lun Lin¹  Pei-Yu Kuo¹ 

[1] id="af1-molecules-12-01316">Department of Chemistry and Center for Nanoscience and Technology, Tunghai University, 181, Taichung-Kang Rd. Sec.3, Taichung, Taiwan 4

关键词: Coumarin;    triketone;    acidichromism;    gas sensor;    acid-base sensor;   

DOI  :  10.3390/12071316

来源: mdpi

【 摘 要 】

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.

【 授权许可】

Unknown   
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