Rhenium complexes containing 1,1'-ferrocene dithiolato and diselenolato chelate ligands

The reactions of the rhenium(V) dihalides TpRe(O)Cl-2, Cp*Re(O)Cl-2 and Cp*Re(N(t)Bu)Cl-2 with the dilithium derivative of 1,1'-ferrocene dithiol and diselenol, respectively, have been used to prepare heterodimetallic complexes which contain both rhenium (in the center of a half-sandwich complex) and iron (in the sandwich cage). The six new complexes were characterized by IR, H-1 and C-13 NMR spectroscopy and by EI mass spectrometry. The molecular structure of TpRe(O)[S(2)fc] (1a) was determined by X-ray crystallography which revealed a long non-bonding distance (438.9 pm) between the two metals. (Abbreviations: Cp* = eta(5)-pentamethylcyclopentadienyl, eta(5)-C(5)Me(5); Tp = hydrido-tris(1-pyrazolyl)borate, HB(C3H3N2)(3); Tp* = hydrido-tris(3,5-dimethyl-1-pyrazolyl) borate, HB(C3H(Me(2))N-2)(3); fc = 1,1'-ferrocenylene, Fe(C5H4-)(2); (t)Bu = tert-butyl, C4H9-.)..