Halide coordinated homoleptic [Fe<sub>4</sub>S<sub>4</sub>X<sub>4</sub>]<sup>2−</sup>and heteroleptic [Fe<sub>4</sub>S<sub>4</sub>X<sub>2</sub>Y<sub>2</sub>]<sup>2−</sup>clusters (X, Y = Cl, Br, I)—alternative preparations, structural analogies and spectroscopic properties in solution and solid state
Dalton transactions