Cyclopentadienyliron complex salt, process for preparing the same and photopolymerizable composition containing the same

摘要

A keto arene-cyclopentadienyl iron complex salt of the formula: [(R2CO)(R1)mC6H5-mFeIICp]+1A-1 wherein R1 is an alkyl group, R2 is an alkyl group or phenyl group, m is an integer of 1 to 5, Cp is an eta 5-cyclopentadienyl group and A-1 is a non-nucleophilic anion, e.g. pentamethylacetophenone-Fe(II)-Cp+PF6-1 salt or pentamethylbenzophenone-Fe(II)-Cp+PF6-1 salt, which is useful as a photoinitiator for cationically polymerizable compounds, especially for epoxy resins, and has an improved environmental safety and a high absorptivity, and which can be easily produced by a direct replacement reaction between dicarbonyl- eta 5-(2,4-cyclopentadien-1-yl)iron(II) halide and an alkyl substituted keto arene to be replaced for the carbonyl ligands.