THE YIELD OF EXCITED EU(3-1,2-DIOXETANE IN ITS COMPLEX WITH EU(FOD)(3)() UPON DEGRADATION OF ADAMANTYLIDENEADAMANTANE)

Photophysical properties of excited triplet adamantanone (phosphoresce nce yield (phi(p)(0) and real lifetime tau(p)(0)) in o-xylene at 65 de grees C were studied with the use of chemiluminescence activated by th ermal degradation of adamantylideneadamantane-1,2-dioxetane: phi(p)(0) = 4 x 10(-5) and tau(p)(0) = 4 x 10(-9)s. The yield of chemiexcitatio n to Eu(3+), phi(Eu)*, was estimated in a nonequilibrium complex of a damantanone with Eu(fod)(3) (0.015 < phi(Eu) < 0.04), which was found to be lower than the triplet yield upon dioxetane thermolysis. The di fference between the yields is explained by a decrease in the activati on energy for thermal degradation of the dioxetane in the complex.