cases. Photopolymerization and laser flash photolysisstudies revealed that depending on the concentration initiation by TX-FLCOOH occurs by intra- and intermolecular H-abstraction of the triplet 3(TX-FLCOOH)*. No polymerization was observed when TX-FLCOONa was used as photoinitiator in the absence of a co-initiator. However, TX-FLCOONa acts as an efficient initiator in the visible range in the presence