Synthesis and study of a novel hybrid UV photoinitiator: p‐benzoyldiphenyliodonium hexafluorophosphate (PhCOPhIPhPF6)

Photoinduced Electron Transfer Reactions for Macromolecular Syntheses

“…Phenothiazine and its derivatives are another class of efficient photosensitizers with excellent reducing properties. − In a similar manner, thioxanthones, − carbazoles, − curcumin, , quinoxaline and related structures, − and highly conjugated derivatives of thiophene ,− have been used as long wavelength photosensitizers. Moreover, several other studies have been reported on photosensitization of onium salts based on photoinduced electron transfer reactions for the initiation of cationic polymerization. ,− It was recently shown that ferrocenium salts can promote sensitization of onium salts via photoinduced electron transfer . Photoinduced electron transfer between the excited ferrocenium salt and iodonium salt resulted in the photolysis of the iodonium salt producing ferrocenium radical cations and onium radicals.…”

Recent Progress in Photo-Acid Generators for Advanced Photopolymer Materials

“…Onium salts can absorb light in the long-wavelength region by extending a π-conjugated system of onium salts (Fig. 8) [50,[60][61][62][63][64][65][66][67][68]. However, in a long-wavelength light, the available light energy is lower, and thus it is difficult for the bond cleavage to generate the acid.…”

Visible light initiating systems for photopolymerization: status, development and challenges

“…This mismatching issue was then solved by the synthesis of a cleavage-type hybrid initiator, which combines the characteristic structure of benzophenone and diphenyliodonium salt and has a high initiating efficiency. 137,138 Owing to the narrow spectral absorption of benzophenone and diphenyliodonium salts, the hybrid initiator can only be applied under ultraviolet light. In order to extend the spectral range of such a hybrid initiator, Wang et al designed a cleavage-type hybrid initiator with the structures of benzophenone and ferrocenium (h6-3-benzoyl-4-chloro-diphenylamine) (h5-cyclopentadienyl) iron hexauorophosphate (Fc-NBP).…”