Next Article in Journal
Chlorine Anion Encapsulation by Molecular Capsules Based on Cucurbit[5]uril and Decamethylcucurbit[5]uril
Previous Article in Journal
A Simplified Procedure for Indole Alkaloid Extraction from Catharanthus roseus Combined with a Semi-synthetic Production Process for Vinblastine
Article Menu

Export Article

Open AccessArticle
Molecules 2007, 12(7), 1316-1324;

Design and Synthesis of a Coumarin-based Acidichromic Colorant

Department of Chemistry and Center for Nanoscience and Technology, Tunghai University, 181, Taichung-Kang Rd. Sec.3, Taichung, Taiwan 407
Author to whom correspondence should be addressed.
Received: 6 June 2007 / Revised: 1 July 2007 / Accepted: 1 July 2007 / Published: 6 July 2007
Full-Text   |   PDF [114 KB, uploaded 18 June 2014]   |  


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

Figure 1

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Share & Cite This Article

MDPI and ACS Style

Lin, S.-L.; Kuo, P.-Y.; Yang, D.-Y. Design and Synthesis of a Coumarin-based Acidichromic Colorant. Molecules 2007, 12, 1316-1324.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top