Abstract
Quenching of the fluorescence of Ad=O and its singlet-exited state (1Ad=O*) generated in chemiluminescent reaction of adamantylideneadamantane-1,2-dioxetane (AdOOAd) termolysis by C60 fullerene was detected and investigated. The “quenching efficiency-C60 concentration” plots obtained from the decrease in the fluorescence and chemiluminescence intensities obey the Stern-Volmer law. The bimolecular rate constants (k bim) were determined and the overlap integrals of the Ad=O fluorescence spectra with the C60 absorption spectra (∫ Ov) were calculated. Based on the nonconstant k bim/∫Ov ratios for different singlet-exited energy donors obtained for the 1PAH*-C60 systems (PAH are polycyclic aromatic hydrocarbons) and 1Ad=O*-C60, a conclusion is drawn that quenching of 1Ad=O* by C60 fullerene is a result of inductive-resonant singlet-singlet (major contribution) and exchange-resonant singlet-triplet (minor contribution) energy transfer.
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