The molecular geometry of the complex cation in the title structure, [(mu-Cl)(3){Ru(II)(eta(6)-C(6)Me(6))}(2)][Fe(III)Cl(4)], compares very well with that reported earlier for the corresponding PF(6) salt [Pandey et al. (1999). J.
Organomet. Chem. 592, 278-282].
The [FeCl(4)](-) counter ion has a rather regular tetrahedral geometry with Fe-Cl distances and Cl-Fe-Cl angles in the range 2.1891 (7)-2.2018 (8) angstrom and 107.10 (3)-110.56 (3)degrees, respectively. There are no significant intermolecular interactions in the crystal except for some weak C-H...Cl contacts, which in turn indicates that the crystal packing is determined predominantly by electrostatic interactions between the ionic constituents.