Transition-metal complexes with sulfur ligands. 57. Stabilization of high-valent iron(IV) centers and vacant coordination sites by sulfur .pi.-donation: syntheses, x-ray structures, and properties of [Fe("S2")2(PMe3)n] (n = 1, 2) and (NMe4)[Fe("S2")2-(PMe3)2].cntdot.CH3OH ("S2"2- = 1,2-benzenedithiolate (2-)). [Erratum to document cited in CA114(22):220083s]