SYNERGETIC EFFECTS OF AMINES ON THE INTRA-ION-PAIR ELECTRON-TRANSFER DYE PHOTOSENSITIZATION SYSTEM EO(IPH(2))(2)

Stationary and transient spectroscopic studies on the eosin bis(diphen yliodonium) salt/triethylamine (Eo(IPh(2))(2)/TEA) system were carried out in comparison with Eo(IPh(2))(2) alone. In non-polar solvents whe re Eo(IPh(2))(2) forms contact ion pairs, TEA molecules insert themsel ves between the anions and cations, resulting in the formation of amin e-separated ion pairs. When exposed to visible light, Eo(IPh(2))(2)/TE A undergoes oxidative electron transfer firstly. Synergetic effects of amines on Eo(IPh(2))(2) were found for which a cyclic regenerative me chanism was proposed. Eo(IPh(2))(2)/TEA was applicable for various mon omers and unsaturated oligomers, especially of the acrylate type, even in the presence of oxygen. Concentration effects of Eo(IPh(2))(2), am ine and monomer were also investigated.