Abstract
1 O2) at 238 K and their chemiluminescent efficiency both in fluorescence and phosphorescence was studied while upon heating to temperatures between 313-353 K in dichloromethane. The chemiluminescent phosphorescence can be detected along with the chemi- luminescent fluorescence when compounds (2a, 3a) are decomposed thermally to the corresponding naphthalene diesters (2b, 3b). Experimental evidences for formation of the dioxetanes 1a, 2a and 3a are the observed chemiluminescence spectra which are consistent with the photoluminescence spectra of the excited compounds 1b-3b. Temperature-dependent kinetic measurements reveal an increase of room temperature chemiluminescent phosphorescence efficiency from triplet chemiexcitation processes due to the internal heavy atom effect of compound 3a.
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