Three complexes of the general form [SbCl3](4) .[Ph-Ph] ([Ph-Ph] = bibenzyl, trans-stilbene, or diphenylacetylene) have been isolated in high yield as crystalline solids. The characteristics of the new materials significantly differ from those of the precursors, and their solid state structures have been determined by X-ray crystallography. The pi-complexes are isotypical with each other and with the previously reported [SbCl3](2) .[benzene] complex. On this basis and in comparison with related systems, the factors governing the structure of SbCl3-arene complexes are discussed.