Variations of fluorescence efficiencies of 9-(10H)-acridone and its 4-methoxy derivative with ph. excited-state proton transfer in very weak acids and
✍ Scribed by Stephen G. Schulman; Roy J. Sturgeon
- Book ID
- 102980013
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 596 KB
- Volume
- 93
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
Acridone and its 4-methoxy derivative behave as very weak acids in their lowest excited singlet states. This behavior is shown to account ior the pH dependences of their fluorescence spectra in alkaline solutions. -I-Methoxyacridone is also a very weak base in its lowest excited singlet state, which results in a pH dependence of its fluorescence spectrum in dilute acidic media. Acridone, although functioning as a very weak base in its Iowest excited singlet state, in acidic ethanolic water, does not demonstrate excitedstate proton exchange in acidic "pure" water. This suggests selective salvation by ethanol in the mixed solvent.