A comparative picosecond spectroscopic study of the competitive triple fluorescence of aminosalicylates and benzanilides

Picosecond time-resolved absorption spectroscopy and fluorescence excitation and decay dynamics studies have unravelled the complexities of triple competitive fluorescence in the aminosalicylates and benzanilides. The fluorescences observed are F 1, the normal locally excited state emission S 1 (LE)...

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Bibliographic Details
Published in:Chemical physics 1989-09, Vol.136 (2), p.321-334
Main Authors: Heldt, Jozef, Gormin, David, Kasha, Michael
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Fluorescence and phosphorescence
radiationless transitions, quenching (intersystem crossing, internal conversion)
Molecular properties and interactions with photons
Physics
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Summary:Picosecond time-resolved absorption spectroscopy and fluorescence excitation and decay dynamics studies have unravelled the complexities of triple competitive fluorescence in the aminosalicylates and benzanilides. The fluorescences observed are F 1, the normal locally excited state emission S 1 (LE) → S 0; F′ 2, the proton-transfer tautomer emission S′ 1 (PT) → S′ 0 (PT); and F″ 2, the twisted intramolecular charge-transfer emission S″ 1(TICT) → S 0. The triple fluorescence was observed for p-dimethylaminosalicylic acid methyl ester and for benzanilide, in comparison with other aminosalicylates and benzanilides. Structure selection and solvent perturbation permitted the “tuning in” of F 1, F′ 2, and F″ 2 fluorescences individually and in combination.
ISSN:0301-0104
DOI:10.1016/0301-0104(89)80056-4