ISSN:
0947-3440
Keywords:
Singlet oxygen
;
1,2-Dioxetane
;
Luminescence
;
CIEEL mechanism
;
Triggering
;
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The intramolecular chemically initiated electron-exchange luminescence (CIEEL) of the novel bifunctional dioxetane 2b was studied. By selective chemical triggering, two different functionalities, namely either a phenoxy (ArO-) or an amide (Ar2N-) ion electron donor, were released, dependent on the type of triggering agent used (either base or fluoride ions). From the CIEEL quantum yields (ΦCIEEL) for the triggered chemiluminescence and the fluorescence efficiencies (ΦFl) of the corresponding phenolate (7) and amide (5) emitters the singlet-excitation yields (ΦS) were estimated. Due to the weak fluorescence emission and the low excitation propensity, the triggerable bifunctional dioxetane 2b constitutes an inefficient CIEEL system. For comparison, the activation parameters (EA, lg A, ΔH≠, ΔS≠) of the direct chemiluminescence in the thermal decomposition of the dioxetane 2a were determined by standard isothermal kinetic methods.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jlac.199719970712
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