Binding of ferrocene by cyclic trimeric perfluoro-o-phenylenemercury. Synthesis and structure of the first double-decker sandwich complex of a sandwich

摘要

The first double-decker sandwich complex of a sandwich was synthesized and fully characterized.The complex was prepared by the reaction of cyclic trimeric perfluoro-o-phenylene-mercury (o-C_6F_4Hg)_3 (1) with ferrocene in an ethereal solution at 20 deg C and has the composition {[(o-C_6F_4Hg)_3]_2(Cp_2Fe)} (2).The ferrocene sandwich in 2 is located between the planes of two mercury-containing macrocycles and is coordinated to each of them through donation of the pi-electrons of the eta~5-Cp ligands to vacant orbitals of the mercury atoms of the adjacent molecule 1.It was concluded that all carbon atoms of the eta~5-Cp rings in complex 2 are involved in the bonding to the macrocycles.Complexation with 1 leads to considerable shifts of the v(C-H) and p(C-H) bands of ferrocene in the IR spectrum to high frequencies.The structure of complex 2 was determined by X-ray diffraction.