Identifying the origins of the ring-size specificity of transition metals for polysulfide anions: "tuning" the effect.

A recently published article addresses the long standing problem of why transition metals complexes such as e.g. Cp2TiCl2 in the presence of solutions of polysulfide dianions containing sulfur chains of various lengths, can react to form sulfur ring complexes of a specific size, depending on the metal.