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Ferrocenium monocations as photoinitiators for cationic photopolymerization suffer from a limitation oflow absorption and low reactivity under high-pressure Hg lamp.Here,a ferrocenium dication salt,biphenyl bis[(π-cyclopentadienyl)iron]hexafluorophosphate([bis(Cp-Fe)-biphenyl](PF6)2 was synthesized by the ligand ex-change reaction between ferrocene and biphenyl.The chemical structure was characterized with FTIR and 1HNMR.The separation of ferrocenium monocation cyclopentadien-iron-biphenyl hexafluorophosphate([Cp-Fe-biphenyl]PF6)and dication[bis(Cp-Fe)-biphenyl](PF6)2 was carried out by column chromatography.The photoactivity ofinitiating photopolymerization of epoxide ERl4221 was studied as a cationic photoinitiator.[Bis(Cp-Fe)-biphenyl](PF6)2 can efficiently absorb radiation above 300nm and its photoactivity is higher than that of its monocation.
Ferrocenium monocations as photoinitiators for cationic photopolymerization suffer from a limitation of low absorption and low reactivity under high-pressure Hg lamp. Here, a ferrocenium dication salt, biphenyl bis [(π-cyclopentadienyl) iron] hexafluorophosphate ([bis biphenyl] (PF6) 2 was synthesized by the ligand ex-change reaction between ferrocene and biphenyl. The chemical structure was characterized with FTIR and 1H NMR. The separation of ferrocenium monocation cyclopentadien-iron-biphenyl hexafluorophosphate ([Cp- Fe- biphenyl] PF6 Bis (Cp-Fe) -biphenyl] (PF6) 2 was carried out by column chromatography. The photoactivity of initiating photopolymerization of epoxide ERl4221 was studied as a cationic photoinitiator. [Bis ) 2 can efficiently absorb radiation above 300 nm and its photoactivity is higher than that of its monocation.