The spectra indicated that a
ground-state complex was formed between the dye and polyamide on dyeing. The energy levels of the complex’s electronic states favor triplet-triplet energy transfer from the nylon to the complex. The energy is transferred by an exchange
mechanism. An additional energy transfer occurred between the excited dye and the complex by either a singlet-triplet or triplet-triplet mechanism. The dye-nylon complex sensitizes the polyamide photo-oxidative degradation at its own expense