✦ LIBER ✦

Triple fluorescence in aminosalicylates. Modulation of normal, proton-transfer, and twisted intramolecular charge-transfer (TICT) fluorescence by physical and chemical perturbations

✍ Scribed by David Gormin; Michael Kasha

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 260 KB
Volume: 153
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(88)85263-1

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✦ Synopsis

Three competitive fluorescence emissions are shown to be observable from a common initial excited singlet state in a prototype aminosalicylate molecule: 2-hydroxy-4-dimethylaminobenzoic acid methyl ester. The fluorescences are assigned as the normal fluorescence S, (x, rr*)-S,,, the twisted intramolecular charge-transfer or TICT-state fluorescence S;(TICT)-So, and the intramolecular proton-transfer fluorescence S', (PT) -SO. Chemical substitution and solvent polarity perturbations are used to corroborate the assignments.

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✍ Khader A. Al-Hassan; Uwe K.A. Klein; A. Suwaiyan 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 501 KB

Dual fluorescence of 4dimethylaminobenzonitrile (DMABN) has been used to study the behavior of DMABN in a-cyclodextrine (a-CD). Results obtained indicate that DMABN in an aqueous a-CD solution probably exists in three different environmental conditions; polar, slightly polar and hydrophobic. DMABN s