| 摘要 |
The invention relates to a process for the preparation of pi -arene-iron complexes of the general formula I [R1(R2FeII)a]b+a (LQm)-b (I) wherein a is 1 or 2, b is an integer from 1 to 3, m is an integer corresponding to the valency of L+b, L is a divalent to heptavalent metal or non-metal, Q is a halogen atom, R1 is a pi -arene, an O- or S-heteroarene or a pyrrole or an indole and R2 is a cyclopentadienyl anion or an indenyl anion. The pi -arene-iron complexes of formula I are obtained by ligand exchange at elevated temperatures from pi -arene-iron complexes of formula II [R3(R2FeII)a]b+a (LQm)a-b (II) wherein R3 is a condensed pi -arene which differs from R1. The pi -arene-iron complexes of formula I are suitable as photoinitiators for curable compositions containing cationically polymerizable organic materials.
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