THERMOLYSIS OF ADAMANTYLIDENEADAMANTANE-1,2-DIOXETANE IN THE PRESENCEOF EU(FOD)(3) SORBED ON SILIPORE .2. SPECTRAL CONTENT AND ACTIVATION OF CHEMILUMINESCENCE

Chelate-activated chemiluminescence upon degradation of adamantylidene adamantane-1,2-dioxetane sorbed on Silipore was studied and compared w ith chemilumenscence in solution. The Eu(fod)(3) emission spectrum con sists of D-5(1) --> F-7(j) and D-5(0) --> F-7(j) luminescent transitio ns in the Eu(3+) ion. The D-5(1) --> F-7(j) band is due to intramolecu lar excitation energy transfer from the dioxetane degradation product, adamantanone, to Eu(3+) and emission of the nonequilibrium Eu(3+). ad amantanone complex. The dependence of chemiluminescence intensity on E u(fod)(3) concentration is approximated by the equation 1nl = a[Eu(3+) ] and is different from that in solution. The observed concentration d ependence of chemiluminescence intensity is explained by the branched quantum-chain process in the dioxetane-Eu(fod)(3) system. Interaction of Eu(fod)(3) in its D-5(1) state with the dioxetane . Eu(3+) complex with retention of excitation in the D-5(0) state and formation of ano ther excited Eu(fod)(3) molecule is a key step in the quantum-chain re action.