Lanthanide ions as sensitive probes. Part IV. Transfer of triplet energy from 2-acetylfluorene and 2-acetonaphthone to tervalent terbium in a rigid matrix

Abstract

Triplet-energy transfer from 2-acetylfluorene and 2-acetonaphthone to terbic ion in rigid matrix was studied by measuring the quantum yields of donor phosphorescence and acceptor fluorescence and the decay of donor emission under selective excitation of the ketone at different TbCl₃ concentrations. The bimolecular transfer rate constants derived photokinetically were an order of magnitude greater than the corresponding rate constants for transfer to Eu³⁺. The statistical treatment indicated that there is little separation-dependence in either transfer rate constant and suggested resonance transfer for 2-acetonaphthone–Tb³⁺.