Determination of the distance for triplet energy transfer in the faujasite NaY

Triplet energy transfer from xanthone to 1-methylnaphthalene in the faujasite NaY involves a rapid component which occurs in <100 ns. This process has been examined with laser techniques. The yields of detectable triplet xanthone and 1-methylnaphthalene are interpreted in terms of a statistical model that assumes that the sphere for energy transfer includes the original excitation supercage and its four nearest neighbor supercages; i.e. the donor and acceptor are not required to be in the same supercage. For 1-methylnaphthalene, extensive self-quenching (occurring in the same distance regime as energy transfer) controls the yields of detectable triplets.